4. Thysanocarpus radians Bentham, Pl. Hartw. 297. 1849.
Thysanocarpus radians var. montanus Jepson
Stems 1.5-6 dm. Basal leaves: blade oblanceolate, 1.5-4 cm, margins sinuate-dentate to runcinate-pinnatifid, surfaces usually glabrous, rarely sparsely hirsute, trichomes whitish, 0.3-0.4 mm. Cauline leaves: blade lance-ovate to lanceolate, widest at base, base auriculate-clasping, auricles extending around stem (at least some leaves). Racemes: internodes 9-18 mm in fruit. Fruiting pedicels weakly ascending, straight or nearly so, geniculately-reflexed apically, (proximal) 7-18 mm. Fruits flat, orbicular, (7-10 mm wide); valves pubescent or glabrous, trichomes pointed, ± 0.2 mm; wing entire or with undulate margins, rays distinct, ± 0.1 mm wide.
Flowering Mar-Apr. Meadows in oak woodlands, fields, swales; 20-400 m; Calif., Oreg.
The large (7-10 mm wide), strongly rayed fruits and geniculately reflexed apices of fruiting pedicels make Thysanocarpus radians a very distinctive species. Occasional plants in northern California appear to be hybrids between T. curvipes and T. radians.