Annuals or, rarely, biennials; usually glabrous throughout, rarely sparsely pubescent proxi-mally. Stems (simple or few from base), erect, branched distally, 1.5-6 dm. Basal leaves often not rosulate; blade margins pinnatifid. Cauline leaves petiolate; blade pinnatifid to pinnatisect or pectinate, (lobes 4-10 on each side, linear or oblong to ovate), 4-13 cm × 9-35 mm; base auriculate, margins entire or dentate, or (distally) pinnately lobed. Racemes (subumbellate), considerably elongated. Fruiting pedicels divaricate-ascending to horizontal, straight, 3-11 mm. Flowers: sepals ascending to spreading, oblong, 2-3 × 0.7-1 mm; petals (spreading), yellow, spatulate, 2.5-4 × 0.7-1.2 mm; median filaments 1.8-3 mm; anthers oblong, 0.5-0.8 mm. Fruits siliques, usually curved inward, rarely straight, linear, (8-)10-17(-20) × 1-2 mm; ovules 42-68 per ovary; style 0.5-1(-1.2) mm. Seeds biseriate, reddish brown, cordiform, 0.6-0.9 mm (0.5-0.6 mm diam.), reticulate-foveolate. Flowering Jun-Aug. Wet pastures, moist fields, ponds, ditches, meadows; 1700-2300 m; Ariz., N.Mex.; Mexico (Chihuahua).