Biennial or short-lived perennial to 1.5 m, glabrous or nearly so throughout, or somewhat hairy in the infl, or the lvs minutely puberulent; lvs narrow, the basal narrowly oblanceolate, to 30 × 2 cm, the cauline varying to narrowly lanceolate or lance-elliptic, seldom over 15 × 1.5 cm; infls spicate and ± leafy-bracteate, the tip nodding; hypanthium 3.5–4.5 cm; sep 2–4 cm, the appendages 3–7 mm, subterminal as in no. 2 [Oenothera parviflora L.]; pet 2–4 cm; anthers 8–12 mm; style 2–3.5 cm; fr 2–3 cm, tapering upwards, half as thick at the top as at the base; seeds 1–1.5 mm, prismatic-angled; 2n=14. Shale-barrens; n. Pa. to w. Va. and e. W.Va. July–Sept.
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