Thysanocarpus affinis Greene; T. laciniatus var. affinis (Greene) Munz; T. laciniatus subsp. desertorum (A. Heller) Abrams; T. laciniatus var. eremicola Jepson; T. laciniatus var. ramosus (Greene) Munz; T. ramosus Greene

Foliage usually greenish, sometimes purplish basally. Basal leaves: blade margins often pinnatifid, sometimes sinuate-dentate. Fruiting pedicels usually smoothly recurved, rarely nearly straight. Fruit valves usually glabrous, sometimes pubescent, trichomes clavate, 0.2-0.4 mm.

Flowering Mar-May. Chaparral, rocky slopes, canyons, oak woodlands, washes; 200-1800 m; Ariz., Calif.; Mexico (Baja California).

Variety laciniatus is found in Arizona on the extreme western side of the state.