Annuals or, rarely, perennials; (short-lived, terrestrial or of wet habitat, not submerged); usually glabrous, rarely hirsute, (trichomes cylindrical). Stems (often simple from base), erect, branched distally, (0.5-)1-10 (-14) dm, (sometimes hirsute proximally). Basal leaves rosulate; blade [(4-)6-20(-30) cm × 10-50(-80) mm] margins lyrate-pinnatisect, (abaxial surface sometimes hirsute). Cauline leaves petiolate or subsessile; blade lyrate-pinnatisect, (lateral lobes oblong or ovate when present), (1.5-)2.5-10(-18) cm × (5-)8-25(-30) mm, (lateral lobes smaller than terminal), base auriculate or amplexicaul, margins subentire or irregularly dentate, sinuate, serrate, or crenate, (abaxial surface sometimes hirsute). Racemes often considerably elongated. Fruiting pedicels divaricate or slightly to strongly reflexed, straight or curved, (2.5-)3-10(-14) mm. Flowers: sepals erect, oblong, 1.5-2.4(-2.6) × 0.5-1 mm; petals yellow or pale yellow, spatulate, (1.5-)1.8-2.5(-3) × 0.5-1.5(-2) mm; median filaments 1-2.5 mm; anthers ovate, 0.3-0.5 mm. Fruits usually silicles, rarely siliques, often slightly curved, oblong, ellipsoid, or oblong-ovoid, (2.5-)4-10 × (1.5-)1.7-3(-3.5) mm; ovules 20-90 per ovary; style 0.2-1(-1.2) mm. Seeds biseriate, brown to yellowish brown, ovoid or subglobose, 0.5-0.7(-0.9) mm (0.4- 0.6(-0.7) mm diam.), colliculate.

Plant: Annual, biennial, short-lived perennial herb, ± erect, with 1 dominant stem from base; stem > 3 mm diam; branches 0 or ± from base Leaves: basal and lower cauline short-petioled to sessile, ± clasping stem or not, 5-20(30) cm, oblong to oblanceolate, irregularly dentate to deeply pinnately lobed INFLORESCENCE: racemes, terminal and lateral Flowers: bisexual; sepals 4, free; petals (0)4, free, 1-2.5(3.5) mm, widely spoon-shaped, yellow; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed Fruit: capsule with 2 deciduous valves, generally > 2 mm wide, straight to ± upcurved; pedicel spreading to ascending, 2-14 mm; style 0.2-1 mm, abruptly attached to fruit tip; Seed 10-200, (1)2 rows per chamber, 0.5-1 mm, widely reniform, dense, generally plump; wing 0; embryonic root at edges of both cotyledons Misc: Generally wet areas; < 2000 m.