Hairy Evening-primrose - Oenothera villosa
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
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).