Biennials. Trichomes of leaves 2-or 3-rayed. Stems erect, often branched distally, 0.5-3 (-6.5) dm. Basal leaves (often withered by fruiting); blade linear-oblanceolate, 2-11(-15) cm × (1.5-)2-6 mm, margins usually entire, rarely denticulate. Cauline leaves (distal) sessile; blade margins entire. Racemes (simple or branched), considerably elongated in fruit. Fruiting pedicels divaricate-ascending, slender, narrower than fruit, 4-11(-15) mm. Flowers: sepals linear-oblong, 8-13 mm, lateral pair saccate basally; petals bright or pale yellow, obovate to broadly so, 14-22(-25) × 3-7.5 mm, claw 11-16 mm, apex rounded; median filaments 10-14 mm; anthers linear, 3-4 mm. Fruits ascending, narrowly linear, straight, not torulose, 3-12 cm × (2-) 2.4-3.7 mm, strongly latiseptate, not striped; valves with prominent midvein, pubescent outside, trichomes 2-and 3-rayed, glabrous inside; ovules 34-46 per ovary; style cylindrical, slender, (2-)2.5-5 mm, sparsely pubescent; stigma entire. Seeds ovoid, (2-)2.5-3.5 × 1.3-2.5 mm; wing continuous distally, (0.3-0.8 mm wide). 2n = 36.
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