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Montana Field Guide

Montana Field Guides

Long-tubed Evening-primrose - Oenothera flava

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Native Species

Global Rank: G5
State Rank: SNR
C-value: 6

Agency Status


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General Description
Acaulescent perennial from a simple caudex. Herbage glabrate or sparsely strigose. Leaves linear-oblanceolate, pinnately lobed below 5–25 cm long. Flowers light yellow, drying pinkish; hypanthium 3–10 cm long; sepals 6–12 mm long, free or remaining united at tips; petals 1–3 cm long; stigma lobes ca. 3 mm long. Capsule erect, ovoid, 4-ribbed, 1–3 cm long, glabrate to strigose (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
WA to SK south to CA, NM, TX and Mexico (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(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)

Moist meadows, gravelly soil of roadsides; plains, valleys, montane (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?
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
  • Web Search Engines for Articles on "Long-tubed Evening-primrose"
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Citation for data on this website:
Long-tubed Evening-primrose — Oenothera flava.  Montana Field Guide.  .  Retrieved on , from