Details of...
Scientific Name: Oenothera biennis
Pronunciation: ee-noe-THEER-uh bye-EN-niss
Common Name: evening primrose
Family Name: Onagraceae
Plant Type: Biennial, Invasive plant
Key ID Features: Leaves in first year basal, lance-shaped, shallow-toothed; about 5 cm wide x 10-20 cm long; leaves in the second year spirally arranged on stem arising from the rosette; florets with four yellow petals, in terminal panicles, and open at dusk; capsules pod-like and contain over 100 seeds.
Course(s): not used (on campus)

Habit: Upright
Form: Oval - vertical
Texture: Medium
Mature Size:
Height:0.7 - 1.3m
Spread:0.6 - 1.0m
Growth Rate:Fast
Origin: Canada - eastern, U.S. - northeast
Hardiness Rating: Zone 4: (-34 to -29 C)
Exposure: Full sun
Soil/ Growing Medium:
Landscape Uses: Wildlife food
Additional Info: Google. Cultivar or species of some of the images to be confirmed.
evening primrose
Leaf Morphology: Glossary
Form: Simple
Arrangement: Alternate, Basal
Texture/ Venation: Soft flexible
Surfaces: Pubescent
Colour in Summer: Green, Red
Leaf(let) Terms:
Shapes: Lanceolate, Oblong
Apices: Acute
Margins: Dentate, Undulate (wavy)

Inflorescence Type: Floriferous, Raceme
Flower Morphology:Flowers perfect
Number of Petals:4
Corolla Shape:Campanulate
Ovary Position:Inferior
Colour (petals): Yellow
Flower Scent: Fragrant
Flower Time at Peak: Jun, Jul, Aug, Sep

Fruit Type: Capsule
Fruit Colour: Brown
Fruiting Time: Jun, Jul, Aug, Sep

Bark or Stem Colour:

Pest Susceptibility: Fungal leaf spot, Mildew, ( Pest resistant, Disease resistant, Drought resistant )
(WDH) Wark-Dumais House
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