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

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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Distribution of Oenothera villosa subsp. strigosa
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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

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

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References