Stems 1-3(-4) dm; petioles usually shorter than the blades; lfls linear or linear-elliptic, 0.5-4 cm נ0.5-4 mm; fls few (5-9 open fls and buds); bracts trifoliolate; pet white to ochroleucous, strongly dimorphic, the larger pair 4-5 mm, emarginate and shallowly laciniate with 3-6 segments, the smaller 2-3 mm and more deeply laciniate; stamens 6-9; nectary 2-3.5 נ0.5 mm, tubular, yellow, persistent and drying pink-purple; style 0.5-2 mm, persistent in fr; frs linear-fusiform, slightly inflated, 1.5-3 cm נ3-4 mm, dehiscing nearly to the base; seeds 4-18, 1.7-1.8 mm; 2n=20. Sandy prairies and plains; Great Plains (n. as far as S.D.) e. to Wis. and Ill. (Cristatella j.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.