Scientific Name:
Hieracium aurantiacum
( syn.
Pilosella aurantiaca
)
Pronunciation:
hi-er-uh-KEE-um aw-ran-ti-AYE-kuh
Common Name:
orange hawkweed
Family Name:
Asteraceae
Plant Type:
Herbaceous perennial, Invasive plant
Key ID Features:
All parts with milky sap and wiry pubescence; leaves basal, elliptical to lanceolate, 4-20cm long and 1-3.5cm wide; flowering stem up to 60cm long with 2-25 heads each 1-2.5cm wide, outer ray florets about 20, truncate and notched to have 5 teeth, orange-red then drying to purple; achenes 12-30 per head, each ribbed, 1.5-2mm long, and with bristly hairs. E-Flora BC
Habit:
Spreading
Form:
Irregular
Texture:
Medium
Mature Height:
0.4 - 0.7m
Mature Spread:
0.1 - 0.3m
Growth Rate:
Fast
Origin:
Europe
Hardiness Rating:
Zone 2: (-46 to -40 °C)
Exposure:
Full sun, Part sun/part shade
Soil/Growing Medium:
Rocky or gravelly or dry, Well-drained
Landscape Uses:
Attract butterflies
Additional Info:
Google.
Note: known to readily hybridize with many other species in genus.
Leaf Morphology:
Form:
Simple
Arrangement:
Basal
Texture/Venation:
Soft flexible
Surfaces:
Pubescent
Colour in Summer:
Green, long black hairs
Shapes:
Elliptic, Oblanceolate, Spatulate
Apices:
Obtuse
Bases:
Attenuate
Margins:
Entire, Undulate (wavy)
Additional Info:
Flowering stem may also have a few alternate leaves
Inflorescence Type:
Cyme, Corymb-like
Flower Morphology:
Flowers perfect
Number Of Petals:
0
Corolla Shape:
Ligulate
Ovary Position:
Inferior
Colour (petals):
Orange, Red
Flower Time at Peak:
Jun, Jul, Aug, Sep
Fruit Type:
Achene
Fruit Colour:
Brown
Fruiting Time:
Sep, Oct
Additional Info:
Not showy,
Bark or Stem Colour:
Green
Organ Modifications:
Rhizomes, Runners (or stolons)
Pest Susceptibility:
(Drought tolerant)
