Taprooted perennial; stems several to many, usually simple, 2–4 dm, glabrous; lower lvs narrowly oblanceolate, most cauline lvs linear, 1–2 mm wide; racemes long-pedunculate, slender, 3–8 cm × 5–8 mm, tapering to the tip, often interrupted below; fls white or greenish-white; wings elliptic, 2.5–4 mm, somewhat exceeding the cor; fr elliptic, twice as long as wide; seeds 2–2.5 mm, the aril to half as long; 2n=24, ca 72, 104–108. Prairies, rocky slopes, and barrens; N.D. to Tex., w. to Mont. and Ariz.; rep. from Minn. May–Aug.
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