Glab. to sparsely hairy erect-branching dioec. herb up to 30 cm. or more tall; stock stout, branched above; taproot deeply descending. Radical lvs 7-15 cm. long, linear-oblong in outline, pinnatifid to pinnate, with scarious sheathing bases; pinnules linear, entire to sparingly acutely lobed. Cauline lvs shorter, subsessile, upper ones narrow-linear, entire or toothed. Racemes several, terminal; fls minute on subpatent slender peduncles 3-4 mm. long. Sepals broad-ovate ± 1 mm. long; petals 0 or rudimentary. ♂ with 4-6 stamens, ovary rud.; ♀ with staminodes. Silicles ovate to ovate-oblong in outline, notched, 3-5 mm. long; styles slightly exserted. Seeds compressed-ovoid, ± 2 mm. long, yellowish brown.