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

Oenothera villosa Thunb.
hairy evening primrose (yellow evening-primrose)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #17017)

E-Flora BC Static Map
Distribution of Oenothera villosa
Click here to view our interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
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.
Leaves:
Stem leaves alternate, ascending or spreading, lanceolate or elliptic, 10-30 cm long, entire to minutely-toothed, hairy.
Flowers:
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.
Fruits:
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

Ecology

Ecological Framework for Oenothera villosa

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres)
Slope Gradient (%) 50 50 50
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
42 42 42
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 3 3
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
1
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: IDF(1)

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References