Herbs perennial, 20-90 cm tall. Trichomes almost exclusively malpighiaceous, rarely mixed with few 3-or 4-forked ones on leaves. Stems erect, simple or rarely branched basally. Basal leaves rosulate; petiole 1-4(-8) cm; leaf blade lanceolate to linear-lanceolate, (1.5-)3-10(-15) cm × (2-)3-7(-12) mm, base attenuate or cuneate, margin coarsely dentate, apex acute or acuminate. Upper cauline leaves sessile or subsessile, subentire. Racemes corymbose, densely flowered, bracteate basally, elongated considerably in fruit. Fruiting pedicels divaricate, ascending, or erect, (3-)5-11(-18) mm, stout, narrower than fruit, straight. Sepals lanceolate-linear, (6-)7-10 × 2-2.5 mm, lateral pair saccate. Petals orange-yellow to yellow, obovate, (1.2-)1.5-2(-2.3) cm × (4-)5-6(-7) mm, apex rounded; claw distinct, subequaling or longer than sepals. Filaments yellow, 8-11(-13) mm; anthers linear, 2-3(-3.5) mm. Ovules 50-80 per ovary. Fruit linear, slightly 4-angled or flattened, (5-)8-11 cm × 1.5-2 mm, slightly torulose, erect and subappressed to rachis or ascending to divaricate, straight; valves with a prominent midvein, outside with malpighiaceous trichomes, inside glabrous; style slender, 1-3 mm, cylindric, narrower than fruit; stigma capitate, subentire. Seeds oblong, 1.5-2 × 0.8-1.2 mm. Fl. May-Aug, fr. Jul-Sep.
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