Stems 1-6 dm. Basal leaves: blade oblanceolate to elliptic, 1-6 cm, margins often pinnatifid with narrow lobes (lobes 0.5-1.5 mm), sometimes sinuate-dentate or subentire, surfaces usually glabrous, rarely sparsely hirsute, trichomes whitish, 0.3-0.4 mm. Cauline leaves: blade linear to narrowly elliptic, widest near middle or equally wide throughout, base not auriculate or with small, inconspicuous auricles (not extending around stem). Racemes: internodes (1.5-)2-4.5 mm in fruit. Fruiting pedicels smoothly recurved or straight and stiffly spreading, (proximal) 3-6(-10) mm. Fruits flat or plano-convex, obovate to nearly orbicular, (2.5-5 mm wide); valves often glabrous, sometimes pubescent, trichomes clavate, 0.05-0.4 mm; wing entire or deeply crenate, rays absent or indistinct.

Varieties 3 (3 in the flora): sw United States, nw Mexico.

Lower Taxa

• Thysanocarpus laciniatus var. hitchcockii Munz
• Thysanocarpus laciniatus var. laciniatus
• Thysanocarpus laciniatus var. rigidus Munz