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Annual herb from a taproot; stems erect, several, branched, hairy, becoming sticky-hairy above, 20-90 cm tall.
Basal leaves spoon-shaped, 5-12 cm long, short-stalked; stem leaves opposite, lanceolate to elliptic, 2-10 cm long, up to 4 cm wide, unstalked, hairy above and below; stipules lacking.
Inflorescence of 2-many flowers in a cluster, opening at night, fragrant; petals 5, yellowish beneath and rosy above, glabrous, stalklike at the bases, the blades 7-10 mm long, the stalks 12-25 mm long, 2-cleft less than 1/2 their length; sepals 5, greenish to pinkish, united, forming a woolly, glandular-hairy tube 12-25 mm long, 10-nerved.
Capsules egg-shaped, 1.5-2.5 cm long, 6-valved; seeds 0.8-1.2 mm long, brown, roughened.
Source: The Illustrated Flora of British Columbia