E-Flora BC: Electronic Atlas of the Flora of British Columbia

Acroptilon repens (L.) DC.
Russian knapweed (hardheads)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Reg Newman  Email the photographer   (Photo ID #12117)

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Distribution of Acroptilon repens
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Species Information

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General:
Perennial herb from a rhizome; stems erect, openly branched, densely woolly-hairy, 0.2-1.0 m tall.
Leaves:
Basal leaves oblanceolate, irregularly pinnately-lobed to entire, 3-10 cm long, 1.0-2.5 cm wide; lower stem leaves smaller, pinnately-lobed; upper stem leaves linear to narrowly lanceolate, entire or saw-toothed.
Flowers:
Heads with ray and disk flowers; involucres 9-15 mm tall; involucral bracts in several unequal series, entire, more or less soft-hairy with widely papery tips; ray flowers white to blue, 12-16 mm long; receptacles bristly.
Fruits:
Achenes egg-shaped, 3-4 mm long, slightly compressed, glabrous; pappus of many bristles barbed below, feathery above, more or less deciduous.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry roadsides and disturbed areas in the steppe and montane zones; frequent in S BC east of the Coast-Cascade Mountains; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Centaurea repens
Centaurea picris Pallas ex Willd.

Taxonomic and Nomenclatural Links

Additional Photo Sources

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General References