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Montana Field Guide

Montana Field Guides

Long-tubed Evening-primrose - Oenothera flava

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

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 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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(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 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.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Long-tubed Evening-primrose — Oenothera flava.  Montana Field Guide.  .  Retrieved on , from