1499 plants found
| Species Name | Common Name | Family Name |
|---|---|---|
| Abelia x grandiflora 'Edward Goucher' | Edward Goucher abelia | Caprifoliaceae |
| Abies amabilis | Amabilis fir, Pacific silver fir | Pinaceae |
| Abies balsamea 'Nana' | dwarf balsam fir | Pinaceae |
| Abies cephalonica 'Meyer's Dwarf' | Meyer's Dwarf fir, dwarf Greek fir | Pinaceae |
| Abies concolor | silver fir, Colorado fir, white fir | Pinaceae |
| Abies fraseri | Fraser fir | Pinaceae |
| Abies grandis | grand fir | Pinaceae |
| Abies koreana | Korean fir | Pinaceae |
| Abutilon x hybridum | Chinese lantern , parlour maple , flowering maple | Malvaceae |
| Acaena inermis 'Purpurea' | purple sheep's burr | Rosaceae |
| Acalypha hispida | chenille plant | Euphorbiaceae |
| Acalypha pendula | dwarf chenille plant, firetail | Euphorbiaceae |
| Acanthus mollis | common bear’s breeches | Acanthaceae |
| Acer buergerianum | trident maple | Sapindaceae |
| Acer circinatum | vine maple | Sapindaceae |
| Acer glabrum var. douglasii | Douglas maple, Rocky Mountain maple | Sapindaceae |
| Acer griseum | paperbark maple | Sapindaceae |
| Acer japonicum 'Aconitifolium' | fernleaf maple, fernleaf full moon maple | Sapindaceae |
| Acer macrophyllum | bigleaf maple | Sapindaceae |
| Acer negundo | Manitoba maple , box elder | Sapindaceae |
| Acer palmatum | Japanese maple | Sapindaceae |
| Acer palmatum 'Koto No Ito' | Koto No Ito maple | Sapindaceae |
| Acer palmatum 'Shishio' | Chishio Japanese maple | Sapindaceae |
| Acer palmatum 'Shojo Nomura' | Shojo Nomura maple | Sapindaceae |
| Acer palmatum 'Tsuma Beni' | red nail maple | Sapindaceae |
| Acer palmatum Atropurpureum Group | red-leaf Japanese maple | Sapindaceae |
| Acer palmatum Dissectum Atropurpureum Group | dissected red Japanese maple | Sapindaceae |
| Acer pensylvanicum | moosewood maple | Sapindaceae |
| Acer platanoides | Norway maple | Sapindaceae |
| Acer platanoides 'Crimson King' | Crimson King Norway maple | Sapindaceae |
| Acer platanoides 'Crimson Sentry' | Crimson Sentry maple | Sapindaceae |
| Acer platanoides 'Princeton Gold' | Princeton Gold Norway maple | Sapindaceae |
| Acer pseudoplatanus | sycamore maple | Sapindaceae |
| Acer rubrum | red maple | Sapindaceae |
| Acer rubrum 'Bowhall' | Bowhall maple | Sapindaceae |
| Acer rubrum 'Franksred' | Red Sunset maple | Sapindaceae |
| Acer saccharinum | silver maple | Sapindaceae |
| Acer saccharum | sugar maple | Sapindaceae |
| Acer shirasawanum 'Aureum' | golden full moon maple | Sapindaceae |
| Acer tataricum ssp. ginnala | Amur maple, Tatarian maple | Sapindaceae |
| Acer tegmentosum 'Joe Witt' | Manchurian snakebark maple, Manchu striped maple, Joe Witt striped maple | Sapindaceae |
| Acer x freemanii | Freeman maple, columnar red maple | Sapindaceae |
| Achillea filipendulina 'Gold Plate' | Gold Plate yarrow | Asteraceae |
| Achillea millefolium | common yarrow | Asteraceae |
| Achillea millefolium cvs. | yarrow cultivars | Asteraceae |
| Aconitum carmichaelii | autumn monkshood | Ranunculaceae |
| Aconitum napellus | monkshood | Ranunculaceae |
| Acorus calamus 'Variegatus' | variegated sweet flag | Acoraceae |
| Acorus gramineus 'Variegatus' | variegated sweet flag, variegated Japanese flag | Acoraceae |
| Actaea pachypoda | white baneberry , doll's eyes | Ranunculaceae |
| Actaea simplex (Atropurpurea Group) | dark-leaved bugbane, cimicifuga | Ranunculaceae |
| Actinidia arguta | hardy kiwi | Actinidiaceae |
| Actinidia deliciosa | fuzzy kiwi | Actinidiaceae |
| Actinidia kolomikta | actinidia | Actinidiaceae |
| Actinidia macrosperma | actinidia | Actinidiaceae |
| Adiantum pedatum | maidenhair fern | Pteridaceae |
| Adiantum spp. | maidenhair fern | Pteridaceae |
| Aechmea fasciata | silver urn plant, silver vase | Bromeliaceae |
| Aegopodium podagraria 'Variegatum' | goutweed, bishop's weed | Apiaceae |
| Aeschynanthus spp. | lipstick plant | Gesneriaceae |
| Aesculus chinensis | Chinese horse chestnut | Sapindaceae |
| Aesculus flava | yellow buckeye | Sapindaceae |
| Aesculus hippocastanum | common horse chestnut | Sapindaceae |
| Aesculus x carnea 'Briotii' | ruby horse chestnut, red horse chestnut | Sapindaceae |
| Agapanthus (incl. hybrids) | African lily | Amaryllidaceae |
| Agastache foeniculum | anise-hyssop, giant hyssop | Lamiaceae |
| Agastache mexicana | agastache, Mexican hyssop | Lamiaceae |
| Agave americana | century plant | Asparagaceae |
| Agave filifera | threadleaf agave | Asparagaceae |
| Ageratina altissima 'Chocolate' | white snakeroot | Asteraceae |
| Ageratum houstonianum | floss flower | Asteraceae |
| Aglaonema cvs. | Chinese evergreen | Araceae |
| Agrostis canina | velvet bentgrass | Poaceae |
| Agrostis capillaris | colonial bentgrass | Poaceae |
| Agrostis stolonifera | creeping bentgrass | Poaceae |
| Ailanthus altissima | tree of heaven | Simaroubaceae |
| Ajuga pyramidalis 'Metallica Crispa' | crisp leaf carpet bugle | Lamiaceae |
| Ajuga reptans | bugleweed, carpet bugleweed | Lamiaceae |
| Ajuga reptans cvs. | bugleweed | Lamiaceae |
| Ajuga x tenorii 'Chocolate Chip' | Chocolate Chip carpet bugle | Lamiaceae |
| Akebia quinata | chocolate vine | Lardizabalaceae |
| Albizia julibrissin | silk tree, mimosa | Fabaceae |
| Alcea rosea | hollyhock | Malvaceae |
| Alchemilla mollis | lady's mantle | Rosaceae |
| Allium (incl. hybrids) | hybrid ornamental onion | Amaryllidaceae |
| Allium ampeloprasum | leek | Amaryllidaceae |
| Allium cepa | bulb onion, spring onion , shallot | Amaryllidaceae |
| Allium cernuum | nodding onion | Amaryllidaceae |
| Allium cristophii (incl. hybrids) | ornamental onion, Persian onion | Amaryllidaceae |
| Allium fistulosum | green onion, Welsh onion, Japanese bunching onion | Amaryllidaceae |
| Allium hollandicum (incl. hybrids) | ornamental onion, Persian onion | Amaryllidaceae |
| Allium moly | yellow garlic | Amaryllidaceae |
| Allium sativum | garlic | Amaryllidaceae |
| Allium schoenoprasum | chives | Amaryllidaceae |
| Allium sphaerocephalon | drumstick allium | Amaryllidaceae |
| Allium tuberosum | garlic chives, Chinese chives | Amaryllidaceae |
| Alnus hirsuta | Manchurian alder | Betulaceae |
| Alnus rubra | red alder | Betulaceae |
| Alocasia 'Amazonica' | African mask | Araceae |
| Aloe vera | healing plant | Asphodelaceae |
| Alstroemeria cvs. | alstroemeria, Peruvian lily | Alstroemeriaceae |
| Alyssum montanum 'Berggold' | mountain gold alyssum | Brassicaceae |
| Amelanchier alnifolia | Saskatoon berry, Pacific serviceberry | Rosaceae |
| Amelanchier canadensis | Canadian serviceberry | Rosaceae |
| Anagallis monelli | blue pimpernel | Primulaceae |
| Anaphalis margaritacea | pearly everlasting | Asteraceae |
| Andromeda polifolia | bog rosemary | Ericaceae |
| Andropogon gerardii | big bluestem grass | Poaceae |
| Anemanthele lessoniana | New Zealand wind grass, wind grass, pheasant grass | Poaceae |
| Anemone coronaria | anemone | Ranunculaceae |
| Anemone sylvestris | snowdrop anemone | Ranunculaceae |
| Anemone x hybrida | Japanese windflower , anemone | Ranunculaceae |
| Anemonoides blanda ( syn. Anemone blanda ) | Greek windflower, blue wood anemone | Ranunculaceae |
| Anethum graveolens | dill | Apiaceae |
| Angelica gigas | giant angelica | Apiaceae |
| Angelonia angustifolia | summer snapdragon | Plantaginaceae |
| Antennaria dioica | pussy toes | Asteraceae |
| Anthurium andraeanum (incl. hybrid cvs.) | anthurium, flamingo flower | Araceae |
| Antirrhinum majus | snapdragon | Plantaginaceae |
| Aphelandra squarrosa | zebra plant | Acanthaceae |
| Aquilegia (hybrid cvs.) | hybrid columbine | Ranunculaceae |
| Aquilegia vulgaris | European columbine | Ranunculaceae |
| Arabis caucasica (incl. hybrid cvs.) | rock cress, pink wall cress | Brassicaceae |
| Aralia elata | Japanese angelica tree | Araliaceae |
| Araucaria araucana | monkey puzzle tree | Araucariaceae |
| Araucaria heterophylla | Norfolk Island pine | Araucariaceae |
| Arbutus menziesii | arbutus, madrona | Ericaceae |
| Arbutus unedo | strawberry tree | Ericaceae |
| Arctostaphylos uva-ursi | bearberry , kinnikinnick | Ericaceae |
| Arctotis x hybrida | African daisy | Asteraceae |
| Arenaria montana | mountain sandwort | Caryophyllaceae |
| Argyranthemum frutescens cvs. | Marguerite daisy, cobbitty daisy | Asteraceae |
| Argyrocytisus battandieri | atlas broom, pineapple broom | Fabaceae |
| Arisaema sikokianum | Japanese Jack-in-the-pulpit | Araceae |
| Aristolochia sp. | pipe vine , Dutchman's pipe | Aristolochiaceae |
| Armeria maritima | thrift | Plumbaginaceae |
| Armeria pseudarmeria | perennial armeria | Plumbaginaceae |
| Armeria x hybrida | hybrid thrift | Plumbaginaceae |
| Armoracia rusticana | horseradish | Brassicaceae |
| Aronia melanocarpa | black chokeberry | Rosaceae |
| Arrhenatherum elatius var. bulbosum 'Variegatum' | variegated bulbous oat grass | Poaceae |
| Artemisia 'Powis Castle' | Powis Castle artemisia | Asteraceae |
| Artemisia dracunculus | French tarragon | Asteraceae |
| Artemisia lactiflora Guizhou Group | Guizhou white mugwort | Asteraceae |
| Artemisia ludoviciana 'Valerie Finnis' | Valerie Finnis artemisia | Asteraceae |
| Artemisia schmidtiana | silvermound, wormwood, silver mound | Asteraceae |
| Artemisia stelleriana 'Silver Brocade' | Silver Brocade artemisia | Asteraceae |
| Arum italicum 'Pictum' | painted arum | Araceae |
| Aruncus dioicus | goat's beard | Rosaceae |
| Asarum canadense | Canadian wild ginger | Aristolochiaceae |
| Asarum caudatum | western wild ginger | Aristolochiaceae |
| Asarum europaeum | European wild ginger | Aristolochiaceae |
| Asimina triloba | pawpaw , custard apple | Annonaceae |
| Asparagus densiflorus 'Myersii' | foxtail fern | Asparagaceae |
| Asparagus densiflorus 'Sprengeri' | Sprengeri asparagus fern | Asparagaceae |
| Asparagus officinalis | asparagus | Asparagaceae |
| Asparagus retrofractus | Ming fern, pom pom asparagus fern | Asparagaceae |
| Asparagus setaceus | plumosus fern | Asparagaceae |
| Asparagus virgatus | tree fern, African broom fern | Asparagaceae |
| Asplenium nidus | bird's-nest fern | Aspleniaceae |
| Asplenium scolopendrium | Hart's tongue fern | Aspleniaceae |
| Aster alpinus | alpine aster | Asteraceae |
| Aster spp. ( syn. Symphyotrichum - most ) | common aster | Asteraceae |
| Aster x frikartii 'Monch' | Frikart aster | Asteraceae |
| Astilbe chinensis | Chinese astilbe | Saxifragaceae |
| Astilbe x arendsii cvs. | hybrid astilbe, garden astilbe | Saxifragaceae |
| Astilboides tabularis | shieldleaf rodgersia | Saxifragaceae |
| Astrantia major | masterwort, astrantia | Apiaceae |
| Athyrium filix-femina | lady fern | Athyriaceae |
| Athyrium niponicum var. pictum | Japanese painted fern | Athyriaceae |
| Aubrieta x cultorum | common rock cress | Brassicaceae |
| Aucuba japonica | Japanese aucuba, Japanese laurel | Garryaceae |
| Aurinia saxatilis | perennial alyssum, basket-of-gold, gold dust alyssum | Brassicaceae |
| Azolla filiculoides | Fairy moss, mosquito fern | Salviniaceae |
| Balantium antarcticum | Tasmanian tree fern | Dicksoniaceae |
| Basella alba 'Rubra' | vine spinach, Malabar spinach | Basellaceae |
| Beaucarnea recurvata | ponytail palm | Asparagaceae |
| Begonia corallina ( syn. B. maculata ) | angel wing begonia | Begoniaceae |
| Begonia grandis | hardy begonia, giant begonia | Begoniaceae |
| Begonia masoniana | iron cross begonia | Begoniaceae |
| Begonia rex (incl. hybrids) | rex begonia | Begoniaceae |
| Begonia x hiemalis | Hiemalis begonia, Rieger begonia | Begoniaceae |
| Begonia x hybrida | Dragon Wing begonia | Begoniaceae |
| Begonia x semperflorens cultorum | fibrous begonia, wax begonia | Begoniaceae |
| Begonia x tuberhybrida | tuberous begonia | Begoniaceae |
| Bellis perennis | English daisy | Asteraceae |
| Berberis buxifolia | box leaf barberry, dwarf Magellan barberry | Berberidaceae |
| Berberis julianae | wintergreen barberry | Berberidaceae |
| Berberis spp.1 | barberry (GAZW) | Berberidaceae |
| Berberis spp.2 | barberry (GAZE) | Berberidaceae |
| Berberis thunbergii | Japanese barberry | Berberidaceae |
| Berberis thunbergii 'Golden Nugget' | Golden Nugget Japanese barberry | Berberidaceae |
| Berberis thunbergii var. atropurpurea | red leaf Japanese barberry | Berberidaceae |
| Berberis verruculosa | warty barberry | Berberidaceae |
| Berberis x gladwynensis 'William Penn' | William Penn barberry | Berberidaceae |
| Berberis x stenophylla | narrow-leaf barberry | Berberidaceae |
| Bergenia cordifolia ( syn. of B. crassifolia ) | heartleaf bergenia | Saxifragaceae |
| Beta vulgaris (Cicla Group) | Swiss chard | Amaranthaceae |
| Beta vulgaris (Conditiva Group) | garden beet | Amaranthaceae |
| Betonica officinalis 'Hummelo' ( syn. Stachys monieri ) | alpine betony | Lamiaceae |
| Betula albosinensis | Chinese paper birch | Betulaceae |
| Betula alleghaniensis | yellow birch | Betulaceae |
| Betula lenta | cherry birch, sweet birch, black birch | Betulaceae |
| Betula nigra | river birch | Betulaceae |
| Betula papyrifera | paper birch | Betulaceae |
| Betula pendula | European white birch, silver birch | Betulaceae |
| Betula utilis var. jacquemontii | Jacquemont birch | Betulaceae |
| Bidens ferulifolia (incl. hybrid cvs.) | bidens | Asteraceae |
| Blechnum gibbum 'Silver Lady' | Silver Lady fern, dwarf tree fern | Blechnaceae |
| Blechnum spicant | deer fern | Blechnaceae |
| Bletilla striata | hardy orchid, Chinese ground orchid | Orchidaceae |
| Boltonia asteroides | false aster, Snowbank aster | Asteraceae |
| Bougainvillea cv. | paper flower | Nyctaginaceae |
| Brachyglottis (incl. hybrids) | ragwort, daisy bush | Asteraceae |
| Brachyscome iberidifolia | Swan River daisy | Asteraceae |
| Brachyscome multifida | cut-leaf daisy, rock daisy | Asteraceae |
| Brassica oleracea (Acephala Group) | kale , collard | Brassicaceae |
| Brassica oleracea (Botrytis Group) | cauliflower | Brassicaceae |
| Brassica oleracea (Capitata Group) | cabbage, head cabbage | Brassicaceae |
| Brassica oleracea (Gemmifera Group) | Brussels sprout | Brassicaceae |
| Brassica oleracea (Italica Group) | broccoli | Brassicaceae |
| Brassica rapa var. rapa | turnip | Brassicaceae |
| Briza media | quaking grass | Poaceae |
| Brugmansia spp. | angels' trumpets | Solanaceae |
| Brunnera macrophylla | Siberian bugloss | Boraginaceae |
| Bryophyta (Division) | moss | (various) |
| Buddleja (hybrid cvs.) | hybrid butterfly bush | Scrophulariaceae |
| Buddleja davidii | butterfly bush | Scrophulariaceae |
| Butomus umbellatus | flowering rush | Butomaceae |
| Buxus microphylla | Asian boxwood, Korean boxwood | Buxaceae |
| Buxus sempervirens | common boxwood | Buxaceae |
| Buxus sinica var. insularis 'Winter Gem' | Korean littleleaf boxwood, winter gem boxwood | Buxaceae |
| Caladium bicolor | caladium, angel wings | Araceae |
| Calamagrostis x acutiflora | feather reed grass | Poaceae |
| Calathea makoyana | peacock plant | Marantaceae |
| Calathea roseopicta | calathea | Marantaceae |
| Calceolaria (Herbeohybrida Group) | pocketbook plant, pouch flower, lady's slipper | Calceolariaceae |
| Calceolaria integrifolia | pouch flower | Calceolariaceae |
| Calibrachoa x hybrida | calibrachoa, mini petunia, trailing petunia | Solanaceae |
| Callicarpa bodinieri var. giraldii 'Profusion' | beautyberry | Lamiaceae |
| Callistemon citrinus | crimson bottlebrush | Myrtaceae |
| Calluna vulgaris | heather | Ericaceae |
| Calocedrus decurrens | California incense cedar | Cupressaceae |
| Caltha palustris | yellow marsh marigold | Ranunculaceae |
| Calystegia sepium | morning glory , hedge bindweed | Convolvulaceae |
| Camassia spp. and cvs. | camas, wild hyacinth | Asparagaceae |
| Camellia japonica | common camellia, Japanese camellia | Theaceae |
| Camellia japonica ssp. quercifolia 'White Mermaid' | White Mermaid camellia | Theaceae |
| Camellia sasanqua | sasanqua camellia | Theaceae |
| Campanula carpatica | Carpathian harebell, canterbury bells | Campanulaceae |
| Campanula glomerata | clustered bellflower | Campanulaceae |
| Campanula medium | Canterbury bells | Campanulaceae |
| Campanula persicifolia | peach leaf bellflower, peach-leaved bellflower | Campanulaceae |
| Campanula poscharskyana | Serbian campanula, Serbian bellflower | Campanulaceae |
| Campanula punctata (incl. hybrids) | spotted bellflower, Korean bellflower | Campanulaceae |
| Campanula trachelium | nettle-leaved bellflower | Campanulaceae |
| Campsis radicans | trumpet vine , common trumpet creeper | Bignoniaceae |
| Campsis x tagliabuana 'Madame Galen' | Madam Galam trumpet vine | Bignoniaceae |
| Canna x generalis | canna, garden cannas | Cannaceae |
| Cannabis sativa | marijuana | Cannabaceae |
| Capsella bursa-pastoris | shepherd's purse | Brassicaceae |
| Capsicum annuum cv. | ornamental pepper | Solanaceae |
| Capsicum annuum var. annuum Grossum Group | sweet bell pepper | Solanaceae |
| Capsicum spp. | spicy hot pepper, chili pepper | Solanaceae |
| Caragana arborescens | Siberian peashrub | Fabaceae |
| Cardamine oligosperma | snapweed , little western bittercress | Brassicaceae |
| Carex berggrenii | dwarf bronze creeping sedge | Cyperaceae |
| Carex buchananii | leatherleaf sedge | Cyperaceae |
| Carex comans | Frosted Curls sedge, Bronze sedge | Cyperaceae |
| Carex conica 'Snowline' | variegated Japanese sedge | Cyperaceae |
| Carex elata 'Aurea' | Bowles' golden sedge | Cyperaceae |
| Carex flacca | blue creeping sedge | Cyperaceae |
| Carex morrowii 'Ice Dance' | frosted sedge, creeping Japanese sedge | Cyperaceae |
| Carex oshimensis 'Evergold' | Evergold Japanese sedge | Cyperaceae |
| Carex spp. | sedge (unidentified species) | Cyperaceae |
| Carex testacea | copper hair sedge, New Zealand orange sedge | Cyperaceae |
| Carpinus betulus | European hornbeam | Betulaceae |
| Carpinus fangiana | Fang's hornbeam, monkey tail hornbeam | Betulaceae |
| Carpinus japonica | Japanese hornbeam | Betulaceae |
| Caryopteris incana 'Jason' | Sunshine Blue bluebeard | Verbenaceae |
| Caryopteris x clandonensis | bluebeard | Verbenaceae |
| Caryota mitis | fishtail palm | Arecaceae |
| Castanea sativa | sweet chestnut | Fagaceae |
| Castanospermum australe | lucky bean | Fabaceae |
| Castilleja spp. | Indian paintbrush, harsh paintbrush | Orobanchaceae |
| Catalpa bignonioides | southern catalpa | Bignoniaceae |
| Catalpa speciosa | western catalpa, northern catalpa | Bignoniaceae |
| Ceanothus gloriosus 'Point Reyes' | Point Reyes creeper | Rhamnaceae |
| Ceanothus thyrsiflorus 'Victoria' | Victoria lilac, summer lilac, California lilac | Rhamnaceae |
| Ceanothus x delilianus 'Gloire de Versailles' | Glory of Versaille lilac | Rhamnaceae |
| Cedrus atlantica Glauca Group | blue Atlas cedar | Pinaceae |
| Cedrus deodara | Deodar cedar | Pinaceae |
| Cedrus libani | cedar of Lebanon | Pinaceae |
| Celastrus scandens | American bittersweet | Celastraceae |
| Celosia argentea (syn. C. cristata ) | cockscomb, plumed celosia | Amaranthaceae |
| Centaurea dealbata | Persian cornflower | Asteraceae |
| Centaurea montana | bachelor's buttons | Asteraceae |
| Centaurea stoebe | spotted knapweed | Asteraceae |
| Centranthus ruber | red valerian , Jupiter's beard | Caprifoliaceae |
| Cephalanthus occidentalis | button bush | Rubiaceae |
| Cephalocereus senilis | old-man cactus | Cactaceae |
| Cephalotaxus harringtonia 'Fastigiata' | columnar false yew, Japanese plum-yew | Cephalotaxaceae |
| Cerastium glomeratum ssp. vulgare | mouse-eared chickweed | Caryophyllaceae |
| Cerastium tomentosum | snow-in-summer | Caryophyllaceae |
| Cercidiphyllum japonicum | katsura, Japanese katsura tree | Cercidiphyllaceae |
| Cercis canadensis | redbud | Fabaceae |
| Ceropegia linearis ssp. woodii | string of hearts, rosary vine | Apocynaceae |
| Chaenomeles speciosa ( vs. C. japonica ) | flowering quince | Rosaceae |
| Chaenomeles x superba | dwarf quince | Rosaceae |
| Chamaecyparis lawsoniana | Lawson cypress , Port Orford cypress | Cupressaceae |
| Chamaecyparis obtusa cvs. | Hinoki false cypress | Cupressaceae |
| Chamaecyparis pisifera | false cypress, sawara cypress | Cupressaceae |
| Chamaecyparis pisifera 'Boulevard' | Boulevard false cypress | Cupressaceae |
| Chamaecyparis pisifera 'Filifera Aurea' | gold threadleaf false cypress | Cupressaceae |
| Chamaedorea elegans | parlour palm, neanthe bella palm | Arecaceae |
| Chamaemelum nobile | Roman chamomile | Asteraceae |
| Chamelaucium spp. | wax flower | Myrtaceae |
| Chamerion angustifolium ( syn. Epilobium ) | fireweed | Onagraceae |
| Chasmanthium latifolium | northern sea oats | Poaceae |
| Chenopodium album | lamb's quarters , pigweed | Amaranthaceae |
| Chlorophytum comosum | spider plant, airplane plant | Asparagaceae |
| Choisya ternata | Mexican mock orange | Rutaceae |
| Choisya x dewitteana 'Aztec Pearl' | Mexican mock orange | Rutaceae |
| Chrysanthemum morifolium ( syn. Chrysanthemum x grandiflorum ) | garden mum, florist's mum | Asteraceae |
| Cirsium arvense | Canada thistle | Asteraceae |
| Cirsium vulgare | bull thistle | Asteraceae |
| Cissus alata ( syn. C. rhombifolia ) | grape ivy, Danish ivy | Vitaceae |
| Cissus antarctica | kangaroo vine | Vitaceae |
| Cissus discolor | tapestry vine, Rex begonia vine | Vitaceae |
| Cistus x canescens | rock rose | Cistaceae |
| Cistus x corbariensis | rock rose | Cistaceae |
| Cistus x pulverulentus 'Sunset' | Sunset rock rose | Cistaceae |
| Citrullus lanatus | watermelon | Cucurbitaceae |
| Citrus limon (incl. hybrids) | lemon | Rutaceae |
| Citrus x latifolia | Persian lime | Rutaceae |
| Citrus x paradisi | grapefruit | Rutaceae |
| Clematis 'Nelly Moser' | Nelly Moser clematis | Ranunculaceae |
| Clematis alpina | alpine clematis | Ranunculaceae |
| Clematis armandii | evergreen clematis | Ranunculaceae |
| Clematis montana var. rubens | pink anemone clematis | Ranunculaceae |
| Clematis spp. | clematis | Ranunculaceae |
| Clematis tangutica | Tangutica clematis | Ranunculaceae |
| Clematis vitalba | traveller's joy | Ranunculaceae |
| Cleome hassleriana | spider flower | Cleomaceae |
| Clerodendrum trichotomum | Harlequin glorybower | Lamiaceae |
| Clethra alnifolia | summersweet , sweet pepperbush | Clethraceae |
| Clethra barbinervis | Japanese sweet shrub, Chinese summersweet | Clethraceae |
| Clivia miniata (incl. hybrids) | bush lily, kaffir lily | Amaryllidaceae |
| Codiaeum variegatum var. pictum | croton | Euphorbiaceae |
| Coffea arabica | coffee plant, Arabian coffee | Rubiaceae |
| Colocasia esculenta | taro root, coloyam, elephant's ear | Araceae |
| Consolida | larkspur | Ranunculaceae |
| Convallaria majalis | lily-of-the-valley | Asparagaceae |
| Cordyline indivisa | dracaena spike | Asparagaceae |
| Coreopsis auriculata 'Zamfir' | Zamfir coreopsis | Asteraceae |
| Coreopsis grandiflora | large flowered coreopsis | Asteraceae |
| Coreopsis lanceolata | lanceleaf coreopsis | Asteraceae |
| Coreopsis rosea | pink coreopsis, pink tickseed | Asteraceae |
| Coreopsis spp. & cvs. | coreopsis | Asteraceae |
| Coreopsis verticillata | threadleaf coreopsis, whorled tickseed | Asteraceae |
| Coriandrum sativum | cilantro , coriander , Chinese parsley | Apiaceae |
| Cornus 'Eddie's White Wonder' | Eddie's White Wonder dogwood | Cornaceae |
| Cornus alba | Siberian dogwood, white dogwood | Cornaceae |
| Cornus alba 'Elegantissima' | silverleaf dogwood, Siberian dogwood | Cornaceae |
| Cornus canadensis | bunchberry | Cornaceae |
| Cornus controversa | giant dogwood | Cornaceae |
| Cornus florida | eastern flowering dogwood, pink flowering dogwood | Cornaceae |
| Cornus kousa cvs. | Chinese dogwood, kousa dogwood | Cornaceae |
| Cornus kousa var. chinensis | Chinese dogwood, kousa dogwood | Cornaceae |
| Cornus mas | Cornelian dogwood , Cornelian cherry | Cornaceae |
| Cornus nuttallii | Pacific dogwood | Cornaceae |
| Cornus racemosa | grey dogwood | Cornaceae |
| Cornus sericea | red osier dogwood | Cornaceae |
| Cornus sericea 'Flaviramea' | yellow twig dogwood | Cornaceae |
| Cornus sericea 'Silver and Gold' | variegated dogwood | Cornaceae |
| Cornus x rutgersensis 'Rutcan' | Constellation dogwood | Cornaceae |
| Cortaderia selloana | pampas grass | Poaceae |
| Corylopsis pauciflora | buttercup winter hazel | Hamamelidaceae |
| Corylopsis spicata | spike witchhazel, spike winter hazel | Hamamelidaceae |
| Corylus avellana | European filbert, common hazel | Betulaceae |
| Corylus avellana 'Contorta' | contorted European filbert, Harry Lauder's walking stick, corkscrew hazel | Betulaceae |
| Corylus colurna | Turkish filbert, Turkish hazel | Betulaceae |
| Corylus cornuta var. californica | beaked hazelnut, western beaked hazel | Betulaceae |
| Corylus maxima 'Purpurea' | purple filbert, hazel | Betulaceae |
| Cosmos bipinnatus | cosmos, Mexican aster | Asteraceae |
| Cotinus coggygria | smoke bush | Anacardiaceae |
| Cotoneaster acutifolius | Peking cotoneaster | Rosaceae |
| Cotoneaster apiculatus | cranberry cotoneaster | Rosaceae |
| Cotoneaster dammeri | bearberry cotoneaster | Rosaceae |
| Cotoneaster franchetii | Franchet cotoneaster | Rosaceae |
| Cotoneaster horizontalis | rockspray cotoneaster | Rosaceae |
| Cotoneaster lacteus | Parney cotoneaster | Rosaceae |
| Cotoneaster microphyllus | small-leaf cotoneaster, thyme-leaf cotoneaster | Rosaceae |
| Cotoneaster salicifolius var. floccosus | willowleaf cotoneaster | Rosaceae |
| Crassula ovata | jade plant | Crassulaceae |
| Crataegus douglasii | black hawthorn | Rosaceae |
| Crataegus laevigata | English hawthorn | Rosaceae |
| Crataegus monogyna | common hawthorn | Rosaceae |
| Crataegus phaenopyrum | Washington hawthorn | Rosaceae |
| Crataegus x lavallei | Lavalle hawthorn | Rosaceae |
| Crataegus x mordenensis | Morden hawthorn | Rosaceae |
| Crocosmia 'Lucifer' | Lucifer montbretia | Iridaceae |
| Crocosmia x crocosmiiflora | montbretia | Iridaceae |
| Crocus chrysanthus | snow crocus, golden crocus | Iridaceae |
| Crocus speciosus | fall flowering crocus, Bieberstein's crocus | Iridaceae |
| Crocus vernus (incl. hybrid cvs.) | Dutch crocus, crocus | Iridaceae |
| Crossandra infundibuliformis | firecracker flower | Acanthaceae |
| Cryptanthus bivittatus | earth star | Bromeliaceae |
| Cryptanthus zonatus 'Zebrinus' | zebra plant | Bromeliaceae |
| Cryptomeria japonica | Japanese cedar | Cupressaceae |
| Cryptomeria japonica 'Cristata' | cockscomb Japanese cedar, crested Japanese cedar | Cupressaceae |
| Cryptomeria japonica 'Elegans' | plume Japanese cedar | Cupressaceae |
| Cryptomeria japonica 'Vilmoriniana' | globe Japanese cedar | Cupressaceae |
| Ctenanthe oppenheimiana | never never plant | Marantaceae |
| Cucumis melo | cantaloupe , honeydew , muskmelon | Cucurbitaceae |
| Cucumis sativus | long English cucumber, European cucumber | Cucurbitaceae |
| Cucurbita maxima | pumpkin , winter squash | Cucurbitaceae |
| Cucurbita pepo | summer squash , zucchini | Cucurbitaceae |
| Cunninghamia lanceolata | China fir | Cupressaceae |
| Cuphea hyssopifolia (incl. hybrids) | Mexican heather | Lythraceae |
| Cuphea x purpurea | firecracker | Lythraceae |
| Cupressus arizonica | Arizona cypress | Cupressaceae |
| Cupressus nootkatensis 'Pendula' ( syn. Chamaecyparis ) | weeping Nootka false cypress | Cupressaceae |
| Cupressus nootkatensis ( syn. Chamaecyparis ) | Nootka cypress , yellow cedar | Cupressaceae |
| Cupressus x leylandii | Leyland cypress | Cupressaceae |
| Cycas revoluta | Japanese sago palm | Cycadaceae |
| Cyclamen hederifolium | hardy cyclamen | Primulaceae |
| Cyclamen persicum (incl. hybrids) | cyclamen | Primulaceae |
| Cyclamen repandum | hardy cyclamen, spring sowbread | Primulaceae |
| Cydonia oblonga | quince | Rosaceae |
| Cymbidium (hybrids) | boat orchid | Orchidaceae |
| Cynara cardunculus | cardoon , globe artichoke | Asteraceae |
| Cyperus spp. | papyrus, umbrella plant | Cyperaceae |
| Cyrtomium falcatum | Japanese holly fern | Dryopteridaceae |
| Cytisus scoparius | Scotch broom | Fabaceae |
| Cytisus x praecox | Warminster broom | Fabaceae |
| Dactylis glomerata | orchard grass | Poaceae |
| Dahlia x hybrida | dahlia | Asteraceae |
| Daphne cneorum | rose daphne, garland flower, rock daphne | Thymelaeaceae |
| Daphne laureola | spurge laurel | Thymelaeaceae |
| Daphne odora 'Aureomarginata' | variegated winter daphne | Thymelaeaceae |
| Darmera peltata | umbrella plant | Saxifragaceae |
| Datura inoxia | pricklyburr, thorn apple | Solanaceae |
| Daucus carota ssp. sativus | carrot | Apiaceae |
| Davallia sp. | rabbit's foot fern | Davalliaceae |
| Davidia involucrata | dove tree, kleenex tree, handkerchief tree | Nyssaceae |
| Decaisnea insignis | dead man's fingers | Lardizabalaceae |
| Delosperma spp. | hardy ice plant | Aizoaceae |
| Delphinium (spp. & hybrids) | delphinium | Ranunculaceae |
| Delphinium elatum | delphinium, perennial larkspur | Ranunculaceae |
| Deschampsia cespitosa | tufted hair grass | Poaceae |
| Deutzia gracilis (incl. hybrids) | slender deutzia | Hydrangeaceae |
| Deutzia scabra 'Pride of Rochester' | Pride of Rochester deutzia, fuzzy deutzia | Hydrangeaceae |
| Dianthus barbatus (incl. hybrid cvs.) | sweet William | Caryophyllaceae |
| Dianthus caryophyllus | carnation | Caryophyllaceae |
| Dianthus chinensis (incl. hybrids) | dianthus, China pink | Caryophyllaceae |
| Dianthus deltoides | maiden pink | Caryophyllaceae |
| Dianthus gratianopolitanus | cheddar pink | Caryophyllaceae |
| Dianthus plumarius | cottage pink | Caryophyllaceae |
| Diascia x hybrida | diascia, twinspur | Scrophulariaceae |
| Dicentra (hybrids) | bleeding heart | Papaveraceae |
| Dicentra eximia | fringed bleeding heart | Papaveraceae |
| Dicentra formosa | Pacific bleeding heart | Papaveraceae |
| Dieffenbachia seguine | dumb cane | Araceae |
| Diervilla sessilifolia 'Butterfly' | dwarf bush honeysuckle | Caprifoliaceae |
| Digitalis purpurea | foxglove | Plantaginaceae |
| Digitaria ischaemum | smooth crabgrass | Poaceae |
| Disanthus cercidifolius | red bud hazel | Hamamelidaceae |
| Disocactus ackermannii (& hybrids) | orchid cactus, strap cactus | Cactaceae |
| Doronicum spp. | leopard's bane | Asteraceae |
| Dracaena braunii | ribbon plant, lucky bamboo | Asparagaceae |
| Dracaena fragrans | corn plant, cornstalk dracaena, striped dracaena | Asparagaceae |
| Dracaena marginata | dragon tree, red margined dracaena | Asparagaceae |
| Dracaena reflexa | pleomele | Asparagaceae |
| Dracaena surculosa | gold-dust dracaena | Asparagaceae |
| Dryopteris cycadina | shaggy shield fern | Dryopteridaceae |
| Dryopteris dilatata 'Jimmy Dyce' | Jimmy's upright broad buckler fern | Dryopteridaceae |
| Dryopteris erythrosora | copper shield fern, autumn fern | Dryopteridaceae |
| Dryopteris expansa | northwest wood fern, Buckler fern | Dryopteridaceae |
| Dryopteris filix-mas 'Crispa Cristata' | crested male fern | Dryopteridaceae |
| Dypsis lutescens | Areca palm | Arecaceae |
| Echeveria (sp. & hybrids) | hens and chicks | Crassulaceae |
| Echinacea purpurea | coneflower, echinacea, purple coneflower | Asteraceae |
| Echinacea purpurea cvs. (incl. hybrids) | coneflower | Asteraceae |
| Echinocactus grusonii | golden barrel cactus | Cactaceae |
| Echinochloa crus-galli | barnyard grass | Poaceae |
| Echinops bannaticus | globe thistle | Asteraceae |
| Echium vulgare | blueweed, viper's bugloss | Boraginaceae |
| Eichhornia crassipes | water hyacinth , water orchid | Pontederiaceae |
| Elaeagnus angustifolia | Russian olive | Elaeagnaceae |
| Elaeagnus commutata | silverberry , wolf willow | Elaeagnaceae |
| Elaeagnus pungens | thorny elaeagnus, silverthorn | Elaeagnaceae |
| Elaeagnus x ebbingei | elaeagnus, Ebbinge's silverberry | Elaeagnaceae |
| Eleutherococcus sieboldianus | five-fingered aralia, five-leaf aralia | Araliaceae |
| Elymus repens ssp. repens ( syn. Agropyron repens ) | quackgrass , couchgrass | Poaceae |
| Empetrum nigrum | crowberry , crawberry | Ericaceae |
| Enkianthus campanulatus | redvein enkianthus | Ericaceae |
| Epilobium ciliatum ( syn. E. glandulosum ) | common willowherb, fringed willowherb | Onagraceae |
| Epimedium 'Amber Queen' | Amber Queen barrenwort | Berberidaceae |
| Epimedium (hybrid cvs.) | hybrid barrenwort | Berberidaceae |
| Epimedium x cantabrigiense | barrenwort | Berberidaceae |
| Epimedium x perralchicum | yellow epimedium , barrenwort , hybrid bishop's hat | Berberidaceae |
| Epimedium x rubrum | barrenwort | Berberidaceae |
| Epimedium x youngianum | barrenwort | Berberidaceae |
| Epipremnum aureum | devil's ivy , golden pothos | Araceae |
| Equisetum arvense | common horsetail | Equisetaceae |
| Equisetum hyemale | scouring rush , horsetail | Equisetaceae |
| Equisetum spp. | horsetail | Equisetaceae |
| Eremurus x isabellinus | foxtail lily | Asphodelaceae |
| Erica carnea | winter heather | Ericaceae |
| Erica tetralix | cross leaved heath | Ericaceae |
| Erica x darleyensis | erica, heath | Ericaceae |
| Erigeron glaucus | beach aster, seaside daisy | Asteraceae |
| Eryngium alpinum | alpine sea holly | Apiaceae |
| Eryngium planum | blue sea holly, flat sea holly | Apiaceae |
| Eryngium variifolium | marble-leaf sea holly, Moroccan sea holly | Apiaceae |
| Erysimum 'Bowles Mauve' | Bowles Mauve wallflower | Brassicaceae |
| Erysimum cheiri | English wallflower | Brassicaceae |
| Erythronium (hybrid cvs.) | hybrid fawn lily | Liliaceae |
| Erythronium americanum | yellow trout lily , adder's tongue | Liliaceae |
| Escallonia x exoniensis 'Frades' | pink princess escallonia | Escalloniaceae |
| Eschscholzia californica | California poppy | Papaveraceae |
| Eucalyptus sp. | eucalyptus | Myrtaceae |
| Euonymus alatus | burning bush, winged euonymus, winged burning bush | Celastraceae |
| Euonymus europaeus | common spindle tree, European euonymus | Celastraceae |
| Euonymus fortunei | wintercreeper, winter creeper | Celastraceae |
| Euonymus japonicus 'Paloma Blanca' | Paloma Blanca euonymus | Celastraceae |
| Euonymus japonicus 'Silver King' | Silver King euonymus | Celastraceae |
| Eupatorium cannabinum | double hemp agrimony , boneset | Asteraceae |
| Euphorbia 'Charam' | Redwing spurge | Euphorbiaceae |
| Euphorbia amygdaloides | wood spurge, Mrs. Robb's bonnet, purple wood spurge | Euphorbiaceae |
| Euphorbia characias | Mediterranean spurge | Euphorbiaceae |
| Euphorbia cyparissias | cypress spurge | Euphorbiaceae |
| Euphorbia dulcis | sweet spurge | Euphorbiaceae |
| Euphorbia esula | green spurge, leafy spurge | Euphorbiaceae |
| Euphorbia griffithii 'Fireglow' | Fireglow spurge | Euphorbiaceae |
| Euphorbia hybrid cvs. | hybrid spurge | Euphorbiaceae |
| Euphorbia hypericifolia | euphorbia, graceful spurge | Euphorbiaceae |
| Euphorbia mammillaris | corncob plant | Euphorbiaceae |
| Euphorbia milii (incl. hybrids) | crown of thorns | Euphorbiaceae |
| Euphorbia myrsinites | myrtle spurge, donkey-tail spurge | Euphorbiaceae |
| Euphorbia polychroma | golden spurge, cushion spurge | Euphorbiaceae |
| Euphorbia pulcherrima | poinsettia | Euphorbiaceae |
| Euphorbia trigona | African milk tree | Euphorbiaceae |
| Eustoma grandiflorum | lisianthus , prairie gentian , Texas bluebell | Gentianaceae |
| Eutrochium purpureum | Joe Pye weed | Asteraceae |
| Exochorda x 'Blizzard' | Snowy Day Blizzard pearlbush | Rosaceae |
| Fagus grandifolia | American beech | Fagaceae |
| Fagus sylvatica | European beech | Fagaceae |
| Fagus sylvatica 'Aspleniifolia' | fern-leaf beech | Fagaceae |
| Fagus sylvatica 'Dawyck Gold' | gold columnar beech | Fagaceae |
| Fagus sylvatica 'Dawyck Purple' | Dawyck purple beech | Fagaceae |
| Fagus sylvatica 'Purple Fountain' | weeping purple beech | Fagaceae |
| Fagus sylvatica 'Purpurea Pendula' | weeping copper beech | Fagaceae |
| Fagus sylvatica 'Rohan Obelisk' | red obelisk beech | Fagaceae |
| Fagus sylvatica 'Rotundifolia' | round leaf beech | Fagaceae |
| Fagus sylvatica Atropurpurea Group | copper beech | Fagaceae |
| Falkia repens | creeping falkia, African morning glory | Convolvulaceae |
| Fallopia baldschuanica | silver lace vine | Polygonaceae |
| Fallopia japonica ( syn. Reynoutria ) | Japanese knotweed | Polygonaceae |
| Fargesia nitida | fountain bamboo | Poaceae |
| Fatsia japonica | fatsia | Araliaceae |
| Faucaria tigrina | tiger's jaws | Aizoaceae |
| Felicia amelloides | blue marguerite, blue daisy | Asteraceae |
| Ferocactus sp. | barrel cactus | Cactaceae |
| Festuca arundinacea | tall fescue | Poaceae |
| Festuca glauca ( syn. F. ovina glauca ) | blue fescue, blue sheep fescue | Poaceae |
| Festuca idahoensis | Idaho fescue , blue bunchgrass | Poaceae |
| Festuca longifolia | hard fescue, fine fescue | Poaceae |
| Festuca ovina | sheep fescue, fine fescue | Poaceae |
| Festuca rubra var. rubra | creeping red fescue | Poaceae |
| Festuca valesiaca 'Nefer' | Nefer fescue | Poaceae |
| Ficus benghalensis | banyan, Audrey fig | Moraceae |
| Ficus benjamina | weeping ficus, weeping fig | Moraceae |
| Ficus binnendijkii 'Alii' | sabre fig | Moraceae |
| Ficus carica | common fig, garden fig | Moraceae |
| Ficus elastica | rubber plant, India rubber plant, rubber tree | Moraceae |
| Ficus lyrata | fiddle-leaf fig | Moraceae |
| Ficus pumila | creeping fig | Moraceae |
| Filipendula purpurea | Japanese meadowsweet | Rosaceae |
| Filipendula ulmaria | European meadowsweet | Rosaceae |
| Filipendula vulgaris | dropwort | Rosaceae |
| Fittonia albivenis Argyroneura Group | white nerve plant | Acanthaceae |
| Foeniculum vulgare | fennel | Apiaceae |
| Forsythia x intermedia cvs. | showy forsythia | Oleaceae |
| Fothergilla gardenii | dwarf fothergilla, witch alder | Hamamelidaceae |
| Fothergilla major | fothergilla, witch alder | Hamamelidaceae |
| Fragaria 'Frel' | Pink Panda strawberry | Rosaceae |
| Fragaria chiloensis | coastal strawberry, wild strawberry | Rosaceae |
| Fragaria x ananassa | garden strawberry | Rosaceae |
| Frangula purshiana ( syn. Rhamnus ) | cascara | Rhamnaceae |
| Fraxinus (hybrid cvs.) | hybrid ash | Oleaceae |
| Fraxinus americana | American ash, white ash | Oleaceae |
| Fraxinus angustifolia | narrow-leafed ash | Oleaceae |
| Fraxinus excelsior | common or European ash | Oleaceae |
| Fraxinus nigra 'Fallgold' | Fallgold black ash, swamp ash | Oleaceae |
| Fraxinus ornus | flowering ash, manna ash | Oleaceae |
| Fraxinus pennsylvanica | green ash | Oleaceae |
| Fraxinus pennsylvanica cvs. | green ash | Oleaceae |
| Freesia x hybrida | freesia | Iridaceae |
| Fremontodendron californicum | fremontia , California flannel bush | Malvaceae |
| Fritillaria imperialis | crown imperial | Liliaceae |
| Fritillaria meleagris | Guinea hen flower | Liliaceae |
| Fritillaria michailovskyi | fritillary | Liliaceae |
| Fuchsia magellanica 'Riccartonii' | Riccartoni hardy fuchsia | Onagraceae |
| Fuchsia magellanica var. macrostema 'Tricolor' | hardy fuchsia, lady's eardrops | Onagraceae |
| Fuchsia magellanica var. molinae 'Sharpitor' | pink hardy fuchsia | Onagraceae |
| Fuchsia x hybrida | hybrid fuchsia | Onagraceae |
| Fumaria spp. | fumitory | Papaveraceae |
| Gaillardia cvs. | blanket flower | Asteraceae |
| Galanthus nivalis | snowdrop | Amaryllidaceae |
| Galium aparine | northern bedstraw , cleavers | Rubiaceae |
| Galium odoratum | sweet woodruff | Rubiaceae |
| Gardenia jasminoides | gardenia | Rubiaceae |
| Garrya elliptica | wavyleaf silktassel , coast silk-tassel , silk tasselbush | Garryaceae |
| Gaultheria mucronata | pernettya; prickly heath | Ericaceae |
| Gaultheria procumbens | wintergreen | Ericaceae |
| Gaultheria shallon | salal | Ericaceae |
| Gaura lindheimeri | wand flower, bee blossom | Onagraceae |
| Gazania cv. | gazania, treasure flower, African daisy | Asteraceae |
| Genista lydia | lydia genista | Fabaceae |
| Genista pilosa | spreading broom | Fabaceae |
| Geranium (blue hybrid cvs.) | Johnson's Blue geranium, blue hybrid cranesbill | Geraniaceae |
| Geranium cinereum | dwarf cranesbill | Geraniaceae |
| Geranium endressii | Endres's cranesbill, French cranesbill | Geraniaceae |
| Geranium macrorrhizum 'Ingwersen's Variety' | Ingwersen's Variety bigroot geranium | Geraniaceae |
| Geranium molle | dove's foot cranesbill | Geraniaceae |
| Geranium phaeum | mourning widow | Geraniaceae |
| Geranium pratense | meadow cranesbill | Geraniaceae |
| Geranium psilostemon | Armenian cranesbill | Geraniaceae |
| Geranium robertianum | Robert geranium, herb Robert | Geraniaceae |
| Geranium sanguineum | bloody cranesbill | Geraniaceae |
| Geranium spp. and/ or cvs. | geranium, cranesbill | Geraniaceae |
| Geranium x oxonianum | pink cranesbill | Geraniaceae |
| Gerbera jamesonii (incl. hybrids) | Transvaal daisy | Asteraceae |
| Geum coccineum | dwarf orange geum, avens | Rosaceae |
| Geum macrophyllum | large-leaved avens | Rosaceae |
| Gibasis geniculata | Tahitian bridal veil | Commelinaceae |
| Ginkgo biloba | maidenhair tree, ginkgo | Ginkgoaceae |
| Gladiolus cv. | gladiolus, gladioli | Iridaceae |
| Glandularia canadensis ( syn. Verbena ) | trailing verbena | Verbenaceae |
| Glechoma hederacea | creeping Charlie , ground ivy | Lamiaceae |
| Gleditsia triacanthos f. inermis | thornless honey locust | Fabaceae |
| Glyceria maxima 'Variegata' | variegated manna grass | Poaceae |
| Gnaphalium uliginosum | marsh cudweed | Asteraceae |
| Gunnera manicata | gunnera, giant rhubarb | Gunneraceae |
| Guzmania lingulata | scarlet star, vase plant | Bromeliaceae |
| Gymnocarpium dryopteris | oak fern | Cystopteridaceae |
| Gymnocladus dioica | Kentucky coffee tree | Fabaceae |
| Gynura aurantiaca | purple passion plant | Asteraceae |
| Gypsophila paniculata | baby's breath | Caryophyllaceae |
| Hakonechloa macra 'Aureola' | golden variegated hakonechloa | Poaceae |
| Halesia carolina | Carolina silverbell | Styracaceae |
| Hamamelis mollis | Chinese witch hazel | Hamamelidaceae |
| Hamamelis virginiana | American witch hazel | Hamamelidaceae |
| Hamamelis x intermedia | hybrid witch hazel | Hamamelidaceae |
| Hatiora x graeseri | Easter cactus | Cactaceae |
| Haworthia attenuata | zebra haworthia | Asphodelaceae |
| Hebe 'Blue Mist' ( syn. Veronica ) | Blue Mist hebe | Plantaginaceae |
| Hebe 'Mrs. Winder' ( syn. Veronica ) | Mrs. Winder hebe | Plantaginaceae |
| Hebe ochracea ( syn. Veronica ) | ochre whipcord hebe | Plantaginaceae |
| Hebe odora ( syn. Veronica ) | hebe | Plantaginaceae |
| Hedera colchica 'Sulfur Heart' | variegated Persian ivy | Araliaceae |
| Hedera helix | English ivy | Araliaceae |
| Helenium autumnale 'Zimbelstern' | Zimbelstern sneezeweed | Asteraceae |
| Helianthemum nummularium | rock rose | Cistaceae |
| Helianthus annuus cvs. | sunflower | Asteraceae |
| Helianthus tuberosus | Jerusalem artichoke | Asteraceae |
| Helichrysum italicum | curry plant, tall curry | Asteraceae |
| Helichrysum petiolare cvs. | licorice plant | Asteraceae |
| Helichrysum thianschanicum | silver spike | Asteraceae |
| Heliconia spp. | heliconia, lobster claw | Heliconiaceae |
| Helictotrichon sempervirens | blue oat grass | Poaceae |
| Heliopsis helianthoides | false sunflower, oxeye sunflower | Asteraceae |
| Heliotropium arborescens cvs. | heliotrope , cherry pie | Boraginaceae |
| Helleborus foetidus | stinking hellebore | Ranunculaceae |
| Helleborus x hybridus | hybrid Lenten rose | Ranunculaceae |
| Hemerocallis cvs. | daylily | Asphodelaceae (previously Xanthorrhoeaceae) |
| Hemigraphis alternata | waffle plant | Acanthaceae |
| Heracleum lanatum ( syn. of H. sphondylium montanum, H. maximum ) | cow parsnip | Apiaceae |
| Heracleum mantegazzianum | giant hogweed | Apiaceae |
| Herniaria glabra | rupturewort , green carpet | Caryophyllaceae |
| Hesperantha coccinea | crimson flag , river lily | Iridaceae |
| Heuchera americana cvs. | fancy-leaved coral bells | Saxifragaceae |
| Heuchera cvs. | coral bells , alumroot | Saxifragaceae |
| Heuchera micrantha cvs. | fancy-leafed coral bells , small-flowered alumroot , crevice alumroot | Saxifragaceae |
| Heuchera micrantha var. diversifolia 'Palace Purple' | Palace Purple alumroot | Saxifragaceae |
| Heuchera sanguinea | coral bells, red coral bells | Saxifragaceae |
| Heuchera x brizoides | hybrid coral bells, fancy-leaved coral bells | Saxifragaceae |
| Heuchera x villosa | coral bells | Saxifragaceae |
| Hibiscus acetosella | cranberry hibiscus, African rosemallow , false roselle | Malvaceae |
| Hibiscus moscheutos (incl. hybrid cvs.) | hardy hibiscus, swamp rose mallow | Malvaceae |
| Hibiscus rosa-sinensis | Chinese hibiscus | Malvaceae |
| Hibiscus syriacus | hardy hibiscus, rose of Sharon | Malvaceae |
| Hieracium aurantiacum ( syn. Pilosella aurantiaca ) | orange hawkweed | Asteraceae |
| Hippeastrum cvs. | amaryllis | Amaryllidaceae |
| Holcus lanatus | velvet grass | Poaceae |
| Holodiscus discolor | oceanspray | Rosaceae |
| Hordeum vulgare | barley | Poaceae |
| Hosta 'Halcyon' | Halcyon hosta | Asparagaceae |
| Hosta 'June' | June hosta | Asparagaceae |
| Hosta cvs. | hosta, plantain lily | Asparagaceae |
| Hosta sieboldiana | blue hosta | Asparagaceae |
| Hottonia palustris | water violet | Primulaceae |
| Houstonia serpyllifolia | thyme-leaved bluets | Rubiaceae |
| Houttuynia cordata 'Chameleon' | tricolor houttuynia, chameleon plant | Saururaceae |
| Hoya carnosa | wax plant | Apocynaceae |
| Humulus lupulus | common hop | Cannabaceae |
| Hyacinthoides non-scripta | English bluebell | Asparagaceae |
| Hyacinthus orientalis (cvs. & hybrids) | hyacinth | Asparagaceae |
| Hydrangea arborescens | hills of snow, smooth hydrangea | Hydrangeaceae |
| Hydrangea aspera | Chinese hydrangea, rough-leaved hydrangea | Hydrangeaceae |
| Hydrangea macrophylla | bigleaf hydrangea | Hydrangeaceae |
| Hydrangea paniculata | pee gee hydrangea | Hydrangeaceae |
| Hydrangea petiolaris | climbing hydrangea | Hydrangeaceae |
| Hydrangea quercifolia | oakleaf hydrangea | Hydrangeaceae |
| Hylotelephium spectabile 'Herbstfreude' | autumn Joy sedum, hybrid stonecrop | Crassulaceae |
| Hymenocallis latifolia | spider lily | Amaryllidaceae |
| Hypericum calycinum | St. John's wort | Hypericaceae |
| Hypericum perforatum | St. John's wort | Hypericaceae |
| Hypericum x hidcoteense 'Hidcote' | Hidcote St. John's wort | Hypericaceae |
| Hypochaeris radicata | false dandelion | Asteraceae |
| Hypoestes phyllostachya | polka-dot plant | Acanthaceae |
| Iberis sempervirens | evergreen candytuft, rock candytuft, candytuft | Brassicaceae |
| Ilex aquifolium | English holly | Aquifoliaceae |
| Ilex crenata | Japanese holly | Aquifoliaceae |
| Ilex glabra cvs. | inkberry | Aquifoliaceae |
| Ilex x altaclerensis | Highclere holly | Aquifoliaceae |
| Ilex x meserveae | blue holly | Aquifoliaceae |
| Impatiens capensis | jewelweed , orange balsam | Balsaminaceae |
| Impatiens glandulifera | Himalayan balsam | Balsaminaceae |
| Impatiens hawkeri | New Guinea impatiens | Balsaminaceae |
| Impatiens walleriana | impatiens | Balsaminaceae |
| Impatiens x hybrida | hybrid impatiens | Balsaminaceae |
| Imperata cylindrica 'Red Baron' | Japanese blood grass | Poaceae |
| Inula helenium | elecampane | Asteraceae |
| Ipomoea batatas cvs. | sweet potato vine | Convolvulaceae |
| Iresine herbstii | bloodleaf | Amaranthaceae |
| Iris bucharica | Juno iris | Iridaceae |
| Iris ensata | Japanese water iris | Iridaceae |
| Iris pallida 'Variegata' | variegated sweet iris | Iridaceae |
| Iris pseudacorus | yellow flag iris | Iridaceae |
| Iris reticulata | dwarf iris | Iridaceae |
| Iris sibirica | Siberian iris | Iridaceae |
| Iris x germanica | German iris, tall bearded iris | Iridaceae |
| Iris x hollandica | Dutch iris | Iridaceae |
| Isolepis cernua | fiber optic grass | Cyperaceae |
| Jacobaea maritima | dusty miller | Asteraceae |
| Jasminum nudiflorum | winter jasmine | Oleaceae |
| Jasminum polyanthum | jasmine | Oleaceae |
| Juglans nigra | black walnut | Juglandaceae |
| Juncus effusus | common rush, bog rush | Juncaceae |
| Juncus effusus 'Spiralis' | corkscrew rush | Juncaceae |
| Juncus ensifolius | dagger-leaved rush, swordleaf rush | Juncaceae |
| Juniperus chinensis | Chinese juniper | Cupressaceae |
| Juniperus communis | common juniper | Cupressaceae |
| Juniperus horizontalis cvs. | creeping juniper, horizontal juniper | Cupressaceae |
| Juniperus procumbens | Japanese garden juniper, green mound weeping juniper | Cupressaceae |
| Juniperus sabina | tamarix juniper, savin juniper | Cupressaceae |
| Juniperus scopulorum cvs. | Rocky Mountain juniper, Wichita Blue juniper, Tolleson's Blue Weeping juniper | Cupressaceae |
| Juniperus squamata | squamata juniper, Blue Star juniper | Cupressaceae |
| Juniperus virginiana | eastern red cedar | Cupressaceae |
| Justicia brandegeana | shrimp plant | Acanthaceae |
| Kalanchoe blossfeldiana | kalanchoe | Crassulaceae |
| Kalanchoe tomentosa | panda plant | Crassulaceae |
| Kalmia latifolia | mountain laurel | Ericaceae |
| Kalmia microphylla | western bog laurel | Ericaceae |
| Kerria japonica | Japanese kerria | Rosaceae |
| Kirengeshoma palmata | yellow waxbells | Hydrangeaceae |
| Knautia arvensis | field scabious | Caprifoliaceae |
| Knautia macedonica | crimson scabious | Caprifoliaceae |
| Kniphofia uvaria (incl. hybrids) | red hot poker | Asphodelaceae |
| Koeleria glauca | blue hair grass | Poaceae |
| Koelreuteria paniculata | golden rain tree | Sapindaceae |
| Kolkwitzia amabilis | beautybush | Caprifoliaceae |
| Laburnum x watereri | golden chain tree | Fabaceae |
| Lactuca muralis | wall lettuce | Asteraceae |
| Lactuca sativa | lettuce | Asteraceae |
| Lagenaria spp. | gourd | Cucurbitaceae |
| Lagerstroemia fauriei | Japanese crape myrtle | Lythraceae |
| Lamium galeobdolon 'Variegatum' ( syn. Lamiastrum ) | lamium, variegated yellow archangel | Lamiaceae |
| Lamium maculatum | spotted deadnettle, dead nettle | Lamiaceae |
| Lamium purpureum | purple deadnettle | Lamiaceae |
| Lampranthus spp. | trailing ice plant | Aizoaceae |
| Lamprocapnos spectabilis ( syn. Dicentra ) | bleeding heart | Papaveraceae |
| Lantana camara (incl. hybrids) | lantana | Verbenaceae |
| Larix decidua | European larch | Pinaceae |
| Larix kaempferi | Japanese larch | Pinaceae |
| Larix laricina | tamarack, eastern larch | Pinaceae |
| Larix occidentalis | western larch (seedling) | Pinaceae |
| Lathyrus latifolius | perennial pea, everlasting pea | Fabaceae |
| Lathyrus odoratus | sweet pea | Fabaceae |
| Laurus nobilis | bay laurel | Lauraceae |
| Lavandula angustifolia | English lavender | Lamiaceae |
| Lavandula stoechas | French lavender, Spanish lavender | Lamiaceae |
| Lemna minor | common duckweed | Araceae |
| Leptinella squalida | brass buttons | Asteraceae |
| Lespedeza thunbergii | purple bush clover | Fabaceae |
| Leucanthemum vulgare | oxeye daisy | Asteraceae |
| Leucanthemum x superbum | Shasta daisy | Asteraceae |
| Leucothoe axillaris | coast leucothoe | Ericaceae |
| Leucothoe fontanesiana 'Rainbow' | Rainbow leucothoe | Ericaceae |
| Levisticum officinale | lovage, garden lovage | Apiaceae |
| Lewisia cotyledon (incl. hybrids) | lewisia | Montiaceae |
| Leycesteria formosa | Himalayan honeysuckle | Caprifoliaceae |
| Liatris spicata | blazing star, liatris | Asteraceae |
| Ligularia dentata | bigleaf goldenray | Asteraceae |
| Ligularia stenocephala | ligularia | Asteraceae |
| Ligustrum amurense ( syn. L. obtusifolium ) | Amur privet | Oleaceae |
| Ligustrum vulgare | common privet | Oleaceae |
| Lilium cvs. (Asiatic) | Asiatic hybrid lily | Liliaceae |
| Lilium cvs. (Oriental) | Oriental hybrid lily | Liliaceae |
| Lilium lancifolium | tiger lily | Liliaceae |
| Lilium longiflorum | Easter lily | Liliaceae |
| Limonium sinuatum | annual statice | Plumbaginaceae |
| Linaria vulgaris | toadflax | Scrophulariaceae |
| Linnaea borealis | twin flower | Caprifoliaceae |
| Linum spp. | blue flax | Linaceae |
| Liquidambar styraciflua | American sweetgum | Altingiaceae |
| Liriodendron chinense | Chinese tulip tree | Magnoliaceae |
| Liriodendron tulipifera | tulip tree, yellow poplar | Magnoliaceae |
| Liriodendron tulipifera 'Aureomarginatum' | variegated tulip tree | Magnoliaceae |
| Liriope muscari | big blue lilyturf, monkey grass | Asparagaceae |
| Lithodora diffusa | blue lithospermum | Boraginaceae |
| Lobelia cardinalis | cardinal flower | Campanulaceae |
| Lobelia erinus | lobelia | Campanulaceae |
| Lobelia pedunculata | matted pratia, trailing pratia | Campanulaceae |
| Lobelia x speciosa | lobelia | Campanulaceae |
| Lobularia maritima | sweet alyssum, alyssum | Brassicaceae |
| Lolium multiflorum | annual ryegrass, Italian ryegrass | Poaceae |
| Lolium perenne | perennial ryegrass | Poaceae |
| Lonicera henryi | Henry honeysuckle | Caprifoliaceae |
| Lonicera involucrata | black twinberry, bearberry honeysuckle | Caprifoliaceae |
| Lonicera japonica | Japanese honeysuckle | Caprifoliaceae |
| Lonicera nitida | boxleaf honeysuckle | Caprifoliaceae |
| Lonicera nitida 'Red Tips' | boxleaf honeysuckle | Caprifoliaceae |
| Lonicera pileata | privet honeysuckle | Caprifoliaceae |
| Lonicera x brownii 'Dropmore Scarlet' | scarlet trumpet honeysuckle | Caprifoliaceae |
| Lonicera xylosteum | fly honeysuckle, shrub honeysuckle | Caprifoliaceae |
| Lophospermum erubescens | creeping gloxinia | Plantaginaceae |
| Lophospermum purpusii | asarina | Plantaginaceae |
| Lotus berthelotii | parrot's beak, coral gem, pelican's beak , lotus vine | Fabaceae |
| Lunaria annua | silver dollar plant, money plant | Brassicaceae |
| Lupinus polyphyllus (incl. hybrids) | lupine | Fabaceae |
| Luzula nivea | snowy woodrush | Juncaceae |
| Luzula sylvatica | greater woodrush | Juncaceae |
| Lycianthes rantonnetii | blue potato bush | Solanaceae |
| Lysichiton americanus | yellow skunk cabbage , swamp lantern | Araceae |
| Lysimachia clethroides | gooseneck lysimachia | Primulaceae |
| Lysimachia latifolia | starflower | Primulaceae |
| Lysimachia nummularia | creeping Jenny, moneywort | Primulaceae |
| Lysimachia punctata | circle flower, yellow loosestrife | Primulaceae |
| Lythrum salicaria | purple loosestrife | Lythraceae |
| Macleaya cordata | plume poppy | Papaveraceae |
| Magnolia 'Caerhays Belle' | Caerhays Belle magnolia | Magnoliaceae |
| Magnolia 'Galaxy' | Galaxy magnolia | Magnoliaceae |
| Magnolia 'Susan' | Susan's magnolia | Magnoliaceae |
| Magnolia denudata | lily tree, Yulan magnolia | Magnoliaceae |
| Magnolia grandiflora | southern magnolia | Magnoliaceae |
| Magnolia kobus | northern Japanese magnolia | Magnoliaceae |
| Magnolia officinalis | Chinese magnolia, medical magnolia | Magnoliaceae |
| Magnolia sieboldii | Oyama magnolia | Magnoliaceae |
| Magnolia stellata | star magnolia | Magnoliaceae |
| Magnolia x loebneri | Loebner magnolia | Magnoliaceae |
| Magnolia x soulangeana | saucer magnolia | Magnoliaceae |
| Mahonia aquifolium ( syn. Berberis ) | Oregon grape | Berberidaceae |
| Mahonia nervosa ( syn. Berberis ) | longleaf mahonia, dull Oregon grape | Berberidaceae |
| Mahonia repens ( syn. Berberis ) | creeping mahonia, creeping barberry | Berberidaceae |
| Mahonia x media 'Charity' | charity mahonia | Berberidaceae |
| Maianthemum dilatatum | false lily-of-the valley | Asparagaceae |
| Maianthemum racemosum | false Solomon's seal | Asparagaceae |
| Maianthemum stellatum | star-flowered false Solomon's seal | Asparagaceae |
| Malus 'JFS-KW5' | Royal Raindrops crabapple | Rosaceae |
| Malus floribunda | Japanese flowering crabapple | Rosaceae |
| Malus fusca | Pacific crabapple | Rosaceae |
| Malus sylvestris | European crabapple | Rosaceae |
| Malus x domestica | apple | Rosaceae |
| Malva neglecta | common mallow | Malvaceae |
| Mandevilla splendens | shining mandevilla, pink mandevilla | Apocynaceae |
| Manettia luteorubra | Brazilian firecracker , candy corn vine | Rubiaceae |
| Maranta leuconeura | prayer plant, rabbit tracks | Marantaceae |
| Maranta leuconeura 'Erythroneura' | red-veined prayer plant, herringbone plant | Marantaceae |
| Maranta leuconeura var. kerchoviana | prayer plant, rabbit tracks | Marantaceae |
| Marchantia polymorpha | thalloid liverwort, lung liverwort | Marchantiaceae |
| Marsdenia floribunda ( syn. Stephanotis ) | Madagascar jasmine | Apocynaceae |
| Matricaria discoidea | pineapple weed | Asteraceae |
| Matteuccia struthiopteris | ostrich fern | Onocleaceae |
| Matthiola incana | stock | Brassicaceae |
| Meconopsis betonicifolia | Himalayan blue poppy | Papaveraceae |
| Medicago lupulina | black medic | Fabaceae |
| Meliosma pinnata var. oldhamii | meliosma | Sabiaceae |
| Melissa officinalis | lemon balm | Lamiaceae |
| Melliodendron xylocarpum | Chinese parasol | Styracaceae |
| Melothria scabra | cucamelon | Cucurbitaceae |
| Mentha cervina | water spearmint, Hart's pennyroyal | Lamiaceae |
| Mentha spicata | spearmint | Lamiaceae |
| Mentha suaveolens | apple mint | Lamiaceae |
| Mentha x piperita | peppermint | Lamiaceae |
| Mespilus germanica | medlar | Rosaceae |
| Metasequoia glyptostroboides | dawn redwood | Cupressaceae |
| Microbiota decussata | Siberian cypress | Cupressaceae |
| Mikania ternata | plush vine | Asteraceae |
| Mimulus aurantiacus | monkey flower | Phrymaceae |
| Miscanthus sinensis | maiden grass | Poaceae |
| Miscanthus sinensis 'Cosmopolitan' | variegated maiden grass | Poaceae |
| Miscanthus sinensis 'Goliath' | Goliath maiden grass | Poaceae |
| Miscanthus sinensis 'Gracillimus' | Gracillimus maiden grass | Poaceae |
| Miscanthus sinensis 'Little Kitten' | Little Kitten maiden grass | Poaceae |
| Miscanthus sinensis 'Morning Light' | variegated maiden grass | Poaceae |
| Miscanthus sinensis 'Purpurascens' | orange flame grass | Poaceae |
| Miscanthus sinensis 'Silberfeder' | silver feather maiden grass | Poaceae |
| Miscanthus sinensis 'Strictus' | porcupine grass | Poaceae |
| Miscanthus sinensis 'Yaku Jima' | dwarf maiden grass | Poaceae |
| Miscanthus x giganteus | giant silver grass | Poaceae |
| Molinia caerulea ssp. arundinacea 'Skyracer' | tall moor grass | Poaceae |
| Molinia caerulea ssp. caerulea 'Variegata' | variegated moor grass | Poaceae |
| Monarda didyma cvs. | bee balm | Lamiaceae |
| Monopsis unidentata | monopsis | Campanulaceae |
| Monstera deliciosa | Swiss cheese plant or hurricane plant | Araceae |
| Morus alba 'Pendula' | weeping mulberry | Moraceae |
| Muehlenbeckia complexa | creeping wire vine, maidenhair vine, mattress vine | Polygonaceae |
| Mukdenia rossii | mukdenia | Saxifragaceae |
| Musa sp. | banana | Musaceae |
| Muscari armeniacum | grape hyacinth | Asparagaceae |
| Myosotis sylvatica | garden forget-me-not | Boraginaceae |
| Myrica californica | California wax myrtle, Pacific wax myrtle | Myricaceae |
| Myrica gale | bog myrtle, sweet gale | Myricaceae |
| Nandina domestica | heavenly bamboo | Berberidaceae |
| Narcissus 'King Alfred' | King Alfred daffodil | Amaryllidaceae |
| Narcissus cvs. | daffodil | Amaryllidaceae |
| Nassella tenuissima ( syn. Stipa ) | narrow feather grass, Mexican feather grass, angel hair grass | Poaceae |
| Nasturtium officinale | watercress | Brassicaceae |
| Nemesia (incl. hybrids) | nemesia | Plantaginaceae |
| Neoregelia carolinae | blushing bromeliad | Bromeliaceae |
| Nepeta x faassenii cvs. | catmint | Lamiaceae |
| Nephrolepis exaltata | Boston fern | Nephrolepidaceae |
| Nerium oleander | oleander, rose bay | Apocynaceae |
| Nicotiana alata | flowering tobacco, jasmine tobacco | Solanaceae |
| Nicotiana x sanderae | flowering tobacco | Solanaceae |
| Nothofagus antarctica | southern beech | Nothofagaceae |
| Nuphar polysepala | yellow pond lily | Nymphaeaceae |
| Nymphaea (incl. hybrids) | water lily | Nymphaeaceae |
| Nyssa sinensis | Chinese tupelo | Nyssaceae |
| Nyssa sylvatica | black gum | Nyssaceae |
| Ocimum basilicum | sweet basil | Lamiaceae |
| Oemleria cerasiformis | Oso berry, Indian plum | Rosaceae |
| Oenothera biennis | evening primrose | Onagraceae |
| Oenothera fremontii ( syn. O. macrocarpa ) | evening primrose | Onagraceae |
| Olea europaea | hardy olive | Oleaceae |
| Omphalodes cappadocica | Cappadocian navelwort, blue-eyed Mary | Boraginaceae |
| Onoclea sensibilis | sensitive fern | Onocleaceae |
| Ophiopogon planiscapus 'Nigrescens' | black mondo grass | Asparagaceae |
| Oplopanax horridus | devil's club | Araliaceae |
| Opuntia microdasys | bunny ears cactus | Cactaceae |
| Origanum laevigatum 'Herrenhausen' | ornamental oregano | Lamiaceae |
| Origanum majorana | sweet marjoram | Lamiaceae |
| Origanum rotundifolium (incl. hybrids) | hop-like oregano, round-leaved oregano | Lamiaceae |
| Origanum vulgare | oregano | Lamiaceae |
| Ornithogalum spp. | star-of-Bethlehem | Asparagaceae |
| Orostachys iwarenge | Chinese dunce cap | Crassulaceae |
| Osmanthus decorus | lance leaf osmanthus | Oleaceae |
| Osmanthus delavayi | tea olive | Oleaceae |
| Osmanthus heterophyllus 'Tricolor' | variegated osmanthus, false holly | Oleaceae |
| Osmanthus heterophyllus 'Variegatus' | variegated holly osmanthus, false holly | Oleaceae |
| Osmanthus x burkwoodii | Burkwood osmanthus | Oleaceae |
| Osmunda cinnamomea | cinnamon fern | Osmundaceae |
| Osmunda regalis | royal fern | Osmundaceae |
| Osteospermum cvs. | osteospermum, cape daisy | Asteraceae |
| Ostrya virginiana | American hophornbeam, ironwood | Betulaceae |
| Oxalis adenophylla | silver shamrock | Oxalidaceae |
| Oxalis corniculata | creeping oxalis | Oxalidaceae |
| Oxalis oregana | redwood sorrel | Oxalidaceae |
| Oxalis triangularis | false shamrock | Oxalidaceae |
| Oxydendrum arboreum | sorrel tree, sourwood | Ericaceae |
| Pachira aquatica | money tree | Malvaceae |
| Pachysandra terminalis | Japanese spurge | Buxaceae |
| Pachystachys lutea | golden shrimp plant, lollipop plant | Acanthaceae |
| Paeonia lactiflora (incl, hybrids) | garden peony, Chinese peony | Paeoniaceae |
| Paeonia ludlowii (syn. P. lutea - incl. hybrids) | Tibetan tree peony | Paeoniaceae |
| Paeonia suffruticosa | tree peony | Paeoniaceae |
| Panicum virgatum | switch grass | Poaceae |
| Papaver nudicaule | Icelandic poppy, arctic poppy | Papaveraceae |
| Papaver orientale | Oriental poppy | Papaveraceae |
| Parrotia persica | Persian parrotia, Persian ironwood | Hamamelidaceae |
| Parthenocissus henryana | Henryana parthenocissus, Chinese Virginia creeper | Vitaceae |
| Parthenocissus quinquefolia | Virginia creeper | Vitaceae |
| Parthenocissus tricuspidata | Boston ivy | Vitaceae |
| Passiflora (incl. hybrids) | passion flower, passion vine | Passifloraceae |
| Passiflora caerulea | blue passion flower, passion vine | Passifloraceae |
| Paulownia tomentosa | princess tree, empress tree | Paulowniaceae |
| Paxistima myrsinites | Oregon boxwood, false box | Celastraceae |
| Pelargonium graveolens | rose geranium, citronella geranium | Geraniaceae |
| Pelargonium peltatum | ivy-leaf geranium | Geraniaceae |
| Pelargonium spp. | geranium | Geraniaceae |
| Pelargonium x domesticum | pelargonium, regal geranium | Geraniaceae |
| Pelargonium x hortorum | zonal geranium, bedding geranium, hybrid geranium | Geraniaceae |
| Pellaea rotundifolia | button fern | Pteridaceae |
| Peltandra virginica | arrow arum | Araceae |
| Pennisetum alopecuroides | fountain grass | Poaceae |
| Pennisetum alopecuroides 'Little Bunny' | dwarf fountain grass | Poaceae |
| Pennisetum alopecuroides 'Moudry' | black-flowered fountain grass | Poaceae |
| Pennisetum glaucum 'Purple Majesty' | purple ornamental millet | Poaceae |
| Pennisetum massaicum 'Red Bunny Tails' | Red Bunny Tails | Poaceae |
| Pennisetum orientale | oriental fountain grass | Poaceae |
| Pennisetum setaceum | fountain grass | Poaceae |
| Penstemon barbatus (incl. hybrids) | beard tongue | Plantaginaceae |
| Penstemon cvs. | beard tongue | Plantaginaceae |
| Penstemon digitalis | smooth beard tongue | Plantaginaceae |
| Peperomia argyreia | watermelon peperomia | Piperaceae |
| Peperomia caperata | emerald ripple peperomia | Piperaceae |
| Peperomia griseoargentea | silver-leaf peperomia, platinum pepper | Piperaceae |
| Peperomia magnoliifolia | spoon leaf peperomia | Piperaceae |
| Peperomia obtusifolia | baby rubber plant, blunt-leaved peperomia | Piperaceae |
| Pericallis x hybrida | cineraria , Senetti daisy | Asteraceae |
| Perovskia atriplicifolia ( syn. Salvia yangii ) | Russian sage | Lamiaceae |
| Persicaria affinis | dwarf fleeceflower , Himalayan knotweed | Polygonaceae |
| Persicaria amplexicaulis | mountain fleeceflower | Polygonaceae |
| Persicaria bistorta ( syn. Bistorta officinalis ) | European bistort , snakeweed | Polygonaceae |
| Persicaria campanulata | lesser knotweed | Polygonaceae |
| Persicaria maculosa ( syn. Polygonum persicaria ) | smartweed, lady's thumb | Polygonaceae |
| Persicaria microcephala 'Red Dragon' | Red Dragon knotweed | Polygonaceae |
| Persicaria virginiana 'Painter's Palette' | Painter's Palette fleeceflower | Polygonaceae |
| Petasites japonicus | giant butterbur | Asteraceae |
| Petroselinum crispum | parsley | Apiaceae |
| Petunia x hybrida | petunia , Supertunia mini | Solanaceae |
| Phacelia tanacetifolia | fiddleneck, lacy phacelia | Boraginaceae |
| Phalaenopsis cvs. | moth orchid | Orchidaceae |
| Phalaris arundinacea | reed canary grass, ribbon grass | Poaceae |
| Phaseolus coccineus | scarlet runner bean | Fabaceae |
| Phaseolus vulgaris | common bean, black bean, kidney bean, pinto bean, French bean | Fabaceae |
| Phedimus kamtschaticus ( syn. Sedum kamtschaticum ) | orange stonecrop, Russian stonecrop | Crassulaceae |
| Phegopteris decursive-pinnata | Japanese beech fern | Thelypteridaceae |
| Philadelphus coronarius | mock orange | Hydrangeaceae |
| Philadelphus lewisii | Lewis mock orange | Hydrangeaceae |
| Philadelphus x virginalis | virginal mock orange | Hydrangeaceae |
| Philodendron hederaceum | heart-leaf philodendron | Araceae |
| Philodendron x hybrida | hybrid philodendron | Araceae |
| Phlomis russeliana | sticky Jerusalem sage | Lamiaceae |
| Phlox drummondii | annual phlox | Polemoniaceae |
| Phlox paniculata | summer phlox, border phlox, common phlox | Polemoniaceae |
| Phlox subulata | creeping phlox, moss phlox | Polemoniaceae |
| Phoenix roebelenii | Pygmy date palm | Arecaceae |
| Phormium tenax | New Zealand flax | Asphodelaceae |
| Photinia x fraseri | photinia | Rosaceae |
| Phygelius x rectus | cape fuchsia | Scrophulariaceae |
| Phyllostachys aurea | gold stem bamboo, golden bamboo | Poaceae |
| Phyllostachys nigra | blackstem bamboo | Poaceae |
| Physalis alkekengi | Chinese lantern | Solanaceae |
| Physalis philadelphica | tomatillo , Mexican husk tomato | Solanaceae |
| Physocarpus capitatus | Pacific ninebark | Rosaceae |
| Physocarpus opulifolius | common ninebark | Rosaceae |
| Physostegia virginiana | obedient plant, false dragonhead | Lamiaceae |
| Picea abies | Norway spruce | Pinaceae |
| Picea abies 'Acrocona' | Acrocona Norway spruce | Pinaceae |
| Picea abies 'Nidiformis' | nest spruce | Pinaceae |
| Picea abies 'Pendula' | weeping Norway spruce | Pinaceae |
| Picea abies 'Reflexa' | weeping Norway spruce, cat tail spruce | Pinaceae |
| Picea glauca | white spruce | Pinaceae |
| Picea glauca 'Conica' | dwarf Alberta spruce | Pinaceae |
| Picea mariana | black spruce | Pinaceae |
| Picea omorika | Serbian spruce | Pinaceae |
| Picea orientalis | oriental spruce | Pinaceae |
| Picea pungens 'Glauca Globosa' | blue globe Colorado spruce | Pinaceae |
| Picea pungens f. glauca | Colorado blue spruce, Colorado spruce | Pinaceae |
| Picea sitchensis | Sitka spruce | Pinaceae |
| Pieris japonica | lily-of-the-valley shrub , Japanese pieris | Ericaceae |
| Pilea cadierei | aluminum plant | Urticaceae |
| Pilea depressa | artillery plant, giant baby's tears | Urticaceae |
| Pilea involucrata ( syn. Pilea mollis ) | friendship plant | Urticaceae |
| Pilea nummulariifolia | creeping Charlie | Urticaceae |
| Pinus aristata | bristlecone pine | Pinaceae |
| Pinus cembra 'Glauca' | blue Swiss stone pine | Pinaceae |
| Pinus contorta var. contorta | shore pine | Pinaceae |
| Pinus contorta var. latifolia | interior lodgepole pine (seedling) | Pinaceae |
| Pinus densiflora | Japanese red pine | Pinaceae |
| Pinus flexilis 'Vanderwolf's Pyramid' | limber pine, Vanderwolf's pyramid pine | Pinaceae |
| Pinus heldreichii | Bosnian pine | Pinaceae |
| Pinus koraiensis | Korean pine | Pinaceae |
| Pinus monticola | western white pine (seedling) | Pinaceae |
| Pinus mugo | mugo pine, Swiss mountain pine | Pinaceae |
| Pinus nigra | Austrian pine, black pine | Pinaceae |
| Pinus parviflora | Japanese white pine | Pinaceae |
| Pinus ponderosa | Ponderosa pine, yellow pine | Pinaceae |
| Pinus strobiformis | southwestern white pine, Mexican white pine (seedling) | Pinaceae |
| Pinus strobus | eastern white pine | Pinaceae |
| Pinus strobus 'Radiata' | dwarf eastern white pine | Pinaceae |
| Pinus sylvestris | Scots pine | Pinaceae |
| Pinus sylvestris cvs. | Scots pine (cultivars) | Pinaceae |
| Pinus thunbergii | Japanese black pine | Pinaceae |
| Pinus wallichiana | Himalayan pine, Butan pine, blue pine | Pinaceae |
| Pistia stratiotes | water lettuce | Araceae |
| Pisum sativum | garden pea | Fabaceae |
| Plantago lanceolata | narrow-leaved plantain | Plantaginaceae |
| Plantago major | broad-leaved plantain | Plantaginaceae |
| Platanus x acerifolia ( syn. P. x hispanica ) | London plane | Platanaceae |
| Platanus orientalis | oriental plane tree, oriental sycamore | Platanaceae |
| Platycerium bifurcatum | staghorn fern | Polypodiaceae |
| Platycladus orientalis 'Aurea Nana' | dwarf golden cedar, oriental arborvitae | Cupressaceae |
| Plectranthus scutellarioides hybrids & cvs. ( syn. Solenostemon ) | coleus | Lamiaceae |
| Plectranthus verticillatus | Swedish ivy | Lamiaceae |
| Plumbago auriculata | blue plumbago, cape leadwort | Plumbaginaceae |
| Poa annua | annual bluegrass | Poaceae |
| Poa annua var. reptans | creeping bluegrass | Poaceae |
| Poa compressa | Canada bluegrass | Poaceae |
| Poa pratensis | Kentucky bluegrass | Poaceae |
| Poa supina | supina bluegrass | Poaceae |
| Poa trivialis | rough bluegrass, rough-stalked meadow grass | Poaceae |
| Podocarpus lawrencei ( syn. P. alpinus ) | Tasmanian podocarp | Podocarpaceae |
| Podocarpus macrophyllus | Buddhist pine , Japanese yew | Podocarpaceae |
| Podocarpus nivalis | alpine totara, mountain totara | Podocarpaceae |
| Polemonium caeruleum | Jacob's ladder | Polemoniaceae |
| Polianthes tuberosa | tuberose | Asparagaceae |
| Polygonatum biflorum | Solomon's seal | Asparagaceae |
| Polygonum aviculare | prostrate knotweed | Polygonaceae |
| Polypodium glycyrrhiza | licorice fern | Polypodiaceae |
| Polyscias balfouriana | Balfour aralia | Araliaceae |
| Polyscias fruticosa | Ming aralia | Araliaceae |
| Polystichum braunii | Braun's holly fern | Dryopteridaceae |
| Polystichum luctuosum ( syn. P. tsus-simense ) | Korean rock fern | Dryopteridaceae |
| Polystichum munitum | western sword fern | Dryopteridaceae |
| Polystichum polyblepharum | Japanese tassel fern | Dryopteridaceae |
| Polystichum setiferum | hedge fern | Dryopteridaceae |
| Pontederia cordata | pickerel weed | Pontederiaceae |
| Populus alba | white poplar | Salicaceae |
| Populus deltoides | plains cottonwood , necklace poplar | Salicaceae |
| Populus nigra 'Italica' | Lombardy poplar | Salicaceae |
| Populus tremula 'Erecta' | columnar European aspen , columnar Swedish poplar | Salicaceae |
| Populus tremuloides | trembling aspen , white poplar | Salicaceae |
| Populus trichocarpa | black cottonwood , western balsam-poplar | Salicaceae |
| Portulaca grandiflora | portulaca | Portulacaceae |
| Portulaca oleracea | purslane | Portulacaceae |
| Potentilla fruticosa ( syn. Dasiphora fruticosa ) | potentilla, cinquefoil | Rosaceae |
| Potentilla nepalensis | Asian cinquefoil, strawberry cinquefoil | Rosaceae |
| Primula auricula | mountain cowslip | Primulaceae |
| Primula denticulata | drumstick primrose | Primulaceae |
| Primula malacoides | fairy primrose | Primulaceae |
| Primula pauciflora (syn. Dodecatheon pulchellum ) | shooting star | Primulaceae |
| Primula spp. | primrose | Primulaceae |
| Primula vulgaris (incl. hybrids) | primula, primrose | Primulaceae |
| Prunella vulgaris | self-heal | Lamiaceae |
| Prunus 'Kanzan' ( syn. P. 'Kwanzan' ) | flowering cherry, Kwanzan cherry, Kanzan cherry | Rosaceae |
| Prunus 'Shirotae' | Mount Fuji cherry | Rosaceae |
| Prunus (hybrid cvs.) | ornamental cherry tree | Rosaceae |
| Prunus americana | American plum | Rosaceae |
| Prunus avium | sweet cherry, bird cherry | Rosaceae |
| Prunus cerasifera 'Pissardii' | Pissard plum | Rosaceae |
| Prunus laurocerasus | English laurel, cherry laurel | Rosaceae |
| Prunus laurocerasus 'Otto Luyken' | Otto Luyken laurel | Rosaceae |
| Prunus laurocerasus 'Zabeliana' | Zabel laurel | Rosaceae |
| Prunus lusitanica | Portugal laurel | Rosaceae |
| Prunus padus | European bird cherry | Rosaceae |
| Prunus subhirtella 'Pendula Plena Rosea' | double weeping Higan cherry | Rosaceae |
| Prunus virginiana | chokecherry | Rosaceae |
| Prunus x yedoensis | Yoshino cherry | Rosaceae |
| Pseudofumaria lutea | yellow corydalis | Papaveraceae |
| Pseudotsuga menziesii | Douglas fir | Pinaceae |
| Pteris cretica | table fern, ribbon fern, Cretan brake fern | Pteridaceae |
| Pteris ensiformis | table fern, silver lace fern, variegated brake fern | Pteridaceae |
| Pterocarya fraxinifolia | Caucasian wingnut | Juglandaceae |
| Pulmonaria saccharata | lungwort | Boraginaceae |
| Pulsatilla vulgaris ( syn. Anemone pulsatilla ) | pasque flower | Ranunculaceae |
| Purshia tridentata | antelope bitterbrush | Rosaceae |
| Pyracantha coccinea | pyracantha, scarlet firethorn | Rosaceae |
| Pyracantha fortuneana | Chinese firethorn | Rosaceae |
| Pyracantha koidzumii | Formosa firethorn, Taiwan firethorn | Rosaceae |
| Pyrus calleryana | ornamental pear, Callery pear | Rosaceae |
| Pyrus communis | European pear, common pear | Rosaceae |
| Pyrus pyrifolia | Asian pear | Rosaceae |
| Pyrus salicifolia | willowleaf pear | Rosaceae |
| Quercus acutissima | sawtooth oak | Fagaceae |
| Quercus alba | white oak | Fagaceae |
| Quercus coccinea | scarlet oak | Fagaceae |
| Quercus garryana | Garry oak | Fagaceae |
| Quercus macrocarpa | bur oak | Fagaceae |
| Quercus palustris | pin oak | Fagaceae |
| Quercus phellos | willow oak | Fagaceae |
| Quercus robur | English oak | Fagaceae |
| Quercus rubra | red oak | Fagaceae |
| Quercus x warei 'Long' | Regal Prince oak | Fagaceae |
| Radermachera sinica | China doll | Bignoniaceae |
| Ranunculus asiaticus | ranunculus, Persian buttercup | Ranunculaceae |
| Ranunculus ficaria | lesser celandine, pilewort | Ranunculaceae |
| Ranunculus repens | creeping buttercup | Ranunculaceae |
| Raoulia australis | scab plant, scabwort , common mat daisy | Asteraceae |
| Raphanus sativus | radish | Brassicaceae |
| Ravenea rivularis | majesty palm | Arecaceae |
| Rehderodendron macrocarpum | Chinese rehderodendron | Styracaceae |
| Rhapis excelsa | lady palm | Arecaceae |
| Rheum palmatum | Chinese rhubarb | Polygonaceae |
| Rheum rhabarbarum | rhubarb | Polygonaceae |
| Rhododendron | deciduous hybrid azalea | Ericaceae |
| Rhododendron 'Blue Diamond' | Blue Diamond rhododendron | Ericaceae |
| Rhododendron 'Coral Bells' | pink hose in hose azalea, Kurume evergreen azalea | Ericaceae |
| Rhododendron 'Hino Crimson' | Hino Crimson azalea | Ericaceae |
| Rhododendron 'PJM' | PJM rhododendron | Ericaceae |
| Rhododendron 'Purple Splendor' | purple splendor azalea | Ericaceae |
| Rhododendron 'Unique' | Unique rhododendron | Ericaceae |
| Rhododendron (evergreen spp. & cvs.) | rhododendron | Ericaceae |
| Rhododendron cv. | azalea | Ericaceae |
| Rhododendron groenlandicum | Labrador tea | Ericaceae |
| Rhododendron impeditum | impeditum rhododendron | Ericaceae |
| Rhododendron macrophyllum | Pacific rhododendron | Ericaceae |
| Rhodohypoxis baurii | starflower, red-star | Hypoxidaceae |
| Rhodotypos scandens | black jetbead | Rosaceae |
| Rhus glabra | smooth sumac | Anacardiaceae |
| Rhus typhina | staghorn sumac | Anacardiaceae |
| Ribes alpinum | alpine currant | Grossulariaceae |
| Ribes divaricatum | coast black gooseberry, spreading gooseberry | Grossulariaceae |
| Ribes nigrum | black currant | Grossulariaceae |
| Ribes sanguineum | flowering currant, winter currant | Grossulariaceae |
| Ribes uva-crispa | gooseberry | Grossulariaceae |
| Ricinus communis | castor bean | Euphorbiaceae |
| Robinia pseudoacacia | black locust | Fabaceae |
| Rodgersia aesculifolia | fingerleaf rodgersia | Saxifragaceae |
| Rodgersia pinnata | rodgersia | Saxifragaceae |
| Rosa 'Ballerina' | Ballerina rose, hybrid musk rose | Rosaceae |
| Rosa 'Dublin Bay' | Dublin Bay rose | Rosaceae |
| Rosa 'Golden Wings' | Golden Wings rose, hybrid pimpinellifolia shrub rose | Rosaceae |
| Rosa 'Jacqueline du Pre' | Jacqueline du Pre rose | Rosaceae |
| Rosa 'Meidomonac' | Bonica rose | Rosaceae |
| Rosa 'The Fairy' | polyantha rose | Rosaceae |
| Rosa cvs. | hybrid tea rose, cut flower rose, miniature potted rose | Rosaceae |
| Rosa Meineble cvs. | Meidiland carpet rose | Rosaceae |
| Rosa nutkana | Nootka rose | Rosaceae |
| Rosa rugosa | rugosa rose | Rosaceae |
| Rosa woodsii | native rose, Wood's rose | Rosaceae |
| Rosmarinus officinalis | rosemary | Lamiaceae |
| Rubus armeniacus ( syn. Rubus discolor ) | Himalayan blackberry | Rosaceae |
| Rubus fruticosus 'Black Satin' | thornless blackberry | Rosaceae |
| Rubus idaeus | raspberry | Rosaceae |
| Rubus laciniatus | cutleaf evergreen blackberry | Rosaceae |
| Rubus parviflorus | thimbleberry | Rosaceae |
| Rubus rolfei 'Emerald Carpet' | Formosan Carpet rubus, creeping Taiwan bramble | Rosaceae |
| Rubus spectabilis | salmonberry | Rosaceae |
| Rubus ursinus x idaeus | boysenberry | Rosaceae |
| Rudbeckia fulgida | black-eyed Susan | Asteraceae |
| Rudbeckia hirta | black-eyed Susan , gloriosa daisy | Asteraceae |
| Rudbeckia laciniata 'Herbstsonne' | autumn sun coneflower | Asteraceae |
| Rudbeckia occidentalis 'Green Wizard' | Green Wizard coneflower, western coneflower | Asteraceae |
| Ruellia brittoniana | Mexican petunia | Acanthaceae |
| Rumex acetosella | sheep sorrel | Polygonaceae |
| Rumex crispus | curled dock | Polygonaceae |
| Rumex sanguineus | bloody dock, red veined dock | Polygonaceae |
| Rumohra adiantiformis | leatherleaf fern | Dryopteridaceae |
| Ruta graveolens | common rue | Rutaceae |
| Saccharum ravennae | hardy pampas grass, ravenna grass | Poaceae |
| Sagina procumbens |