Oenothera villosa subsp. strigosa Thunb. (Rydb.) W. Dietr. & P.H. Raven
yellow evening-primrose (hairy evening-primrose)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants


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E-Flora BC Static Map

Distribution of Oenothera villosa subsp. strigosa
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Species Information

Biennial herb from a stout taproot; forming rosette in first year and an erect, stiff stem in second; greyish stiff-hairy, also with spreading hairs from red blister-like bases; stems 50-200 cm tall, simple or branched.
Stem leaves alternate, ascending or spreading, lanceolate or elliptic, 10-30 cm long, entire to minutely-toothed, hairy.
Inflorescence a few-flowered, open spike, glandular, buds erect, opening in the evening, subtended by large bracts or reduced leaves; hypanthium 2.5-4 cm long; petals yellow, fading duller or pale orange, 0.7-2 cm long; sepals 0.9-1.8 cm long, often marked reddish, bent back when in flower, the free tips in bud 0.5-2.5 mm long.
Capsules, erect, narrowly lanceolate, 2-3.5 cm long, 4-7 mm wide, more or less straight, 4-chambered, hairy; seeds 1-2 mm long, angled, irregularly pitted.

SourceThe Illustrated Flora of British Columbia


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Habitat and Range

Dry shrubland, roadsides and disturbed areas in the lowland and steppe zones; infrequent in C and S BC east of the Coast-Cascade Mountains, rare along the coast, where probably introduced; E to ON and S to MI, WI, NE, NM, AZ and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Oenothera biennis var. strigosa (Rydb.) Piper
Oenothera cheradophila Bartlett
Oenothera depressa subsp. strigosa (Rydb.) Roy L. Taylor & MacBryde
Oenothera procera Woot. & Standl.
Oenothera rydbergii House
Oenothera strigosa (Rydb.) Mack. & Bush
Oenothera strigosa subsp. cheradophila (Bartlett) Munz
Oenothera villosa subsp. cheradophila (Bartlett) W. Dietr. & Raven
Oenothera villosa var. strigosa (Rydb.) Dorn