Annuals; glabrous or sparsely puberulent. Rhizomes absent. Stems (simple or several from base), erect or decumbent, (flexuous or straight, narrowly winged-angled), unbranched or branched distally, (1.4-)2-4.5 (-5.3) dm. Basal leaves (soon withered), not rosulate. Cauline leaves 3-9, middle ones 5-9-foliolate, petiolate, leaflets petiolulate or subsessile; petiole 1-3 cm, base not auriculate; lateral leaflets similar to terminal, blade often smaller, with oblique base, distal leaflets subsessile, blade smaller and narrower distally; terminal leaflet (petiolule 0.2-0.8 cm), blade usually broadly ovate to narrowly lanceolate, rarely oblong, 0.7-2 cm × 2-10 mm, base cuneate to rounded, margins repand, crenate, or 3-lobed. Racemes ebracteate, (rachis slightly to strongly flexuous or geniculate). Fruiting pedicels horizontal to divaricate or ascending, (3-)4-9(-12) mm. Flowers: sepals oblong, 2-3.5 × 0.7-1.2 mm, lateral pair not saccate basally; petals white, linear, 6-8 × 0.7-1 mm; filaments: median pairs 4-5 mm, lateral pair 3.5-4 mm; anthers oblong, 0.7-1 mm. Fruits linear, (2.5-)3-4.6 cm × 1.7-2.1 mm; ovules 14-22 per ovary; style 1-3 mm. Seeds dark brown, oblong, 2-2.5 × 0.9-1.2 mm.
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