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Montana Field Guide

Montana Field Guides

Hairy Evening-primrose - Oenothera villosa
Other Names:  Oenothera strigosa

Native Species

Global Rank: G5
State Rank: SNR
C-value: 3

Agency Status


External Links

General Description
Taprooted biennial or short-lived perennial. Stems erect, simple or branched at the base, 30–100 cm. Herbage strigose, sparsely hirsute, glandular above. Leaves basal and cauline, lanceolate to oblanceolate; the basal 7–20 cm, deciduous, entire to weakly dentate; cauline leaves reduced upward. Flowers light yellow; hypanthium 2–4 cm long, glandular-puberulent; sepals 1–2 cm long; petals 8–15 mm long; stigma lobes 4–7 mm long. Capsule ascending, linear, 2–5 cm long, cylindric, strigose, hirsute (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
BC to MB south to CA, AZ and OK (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 84

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Usually disturbed soil of roadsides, fields, streambanks; plains, valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus pensylvanicus and Bombus impatiens (Colla and Dumesh 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Eggers, M.J.S. 2005. Riparian vegetation of the Montana Yellowstone and cattle grazing impacts thereon. M.Sc. Thesis. Montana State University, Bozeman, MT. 125 p.
    • Meier, G.A. 1997. The colonization of Montana roadsides by native and exotic plants. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 p.
    • Sater, S. 2022. The insects of Sevenmile Creek, a pictorial guide to their diversity and ecology. Undergraduate Thesis. Helena, MT: Carroll College. 242 p.
    • Tuinstra, K. E. 1967. Vegetation of the floodplains and first terraces of Rock Creek near Red Lodge, Montana. Ph.D dissertation. Montana State University, Bozeman 110 pp.
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Citation for data on this website:
Hairy Evening-primrose — Oenothera villosa.  Montana Field Guide.  .  Retrieved on , from