Herbs annual, (9-)20-70(-100) cm tall. Trichomes primarily 3-or 4-fid, sometimes mixed with 5-fid ones, malpighiaceous trichomes primarily on stem and pedicels. Stems erect, often branched above, ribbed. Basal leaves rosulate, withered by fruiting. Lowermost and middle cauline leaves shortly petiolate or subsessile; leaf blade linear, lanceolate, or oblong, (1-)2-7(-8) cm × (1.5-)2.5-10(-15) mm, mostly with 3-or 4-fid trichomes, base cuneate, margin sinuate-dentate, dentate, or subentire, apex acute or obtuse; uppermost leaves sessile and often entire. Racemes corymbose, densely flowered, ebracteate, elongated considerably in fruit. Fruiting pedicels divaricate or ascending, 3-7(-9) mm, slender, much narrower than fruit. Sepals narrowly oblong, 2-3.5 × 0.4-0.7 mm, not saccate. Petals bright yellow, linear to linear-oblanceolate, 3.5-5(-5.5) × 0.3-0.5(-0.7) mm, apex obtuse; claw undifferentiated from limb. Filaments yellow, 2-4 mm; anthers oblong, 0.4-0.7 mm. Ovules (20-)30-60(-70) per ovary. Fruit linear, terete or slightly 4-angled, (1-)2-3.5(-4) cm × 1-1.3 mm, somewhat torulose, suberect or divaricate-ascending, straight; valves with a distinct midvein, outside with 3-5-forked trichomes, inside densely pubescent; style slender, 0.5-1.5 mm, cylindric; stigma slightly 2-lobed. Seeds oblong, (0.6-)0.7-0.9(-1) × 0.4-0.5 mm. Fl. and fr. Mar-Jul.
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