Oenothera curtiflora

Annual herb to 2.5 m high; main stem simple below, few- to many-branched on inflorescence, softly hairy with long glandular and eglandular hairs. Basal leaves rosetted, obovate or narrowly elliptic 5–15 cm long, 1–3 cm wide, subsessile, deciduous; cauline leaves usually ovate-elliptic, 2–12.5 cm long, 0.5–4 cm wide, subsessile to shortly petiolate, margins somewhat sinuate and minutely toothed. Inflorescence a simple, dense spike to c. 40 cm long. Flowers actinomorphic, opening near sunset and fading by morning; hypanthium 1.5–3 mm long; sepals linear to oblanceolate, 2–3.5 mm long, often failing to separate completely; petals 1.5–3 mm long, pink to rose. Capsule indehiscent, narrowly ellipsoid, 5–11 mm long, c. 2 mm wide, glabrous, 4-ribbed; seeds 2–4. Flowers Dec.–Feb.