Hooker's Evening-primrose - Oenothera elata
Oenothera biennis, Oenothera elata ssp. hirsutissima
Taprooted biennial or short-lived perennial. Stems erect, often branched at the base, 30–100 cm. Herbage strigose, hirsute, glandular. Leaves basal and cauline, lanceolate to oblanceolate; the basal 5–15 cm, entire to weakly dentate; cauline leaves reduced upward. Flowers light yellow; hypanthium 2–4 cm long, pubescent; sepals 2–4 cm long; petals 2–4 cm long, aging orange; stigma lobes 4–5 mm long. Capsule ascending, linear, 2–4 cm long, 4-angled, strigose (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).