Sophia glabra Wooton & Standley, Contr. U.S. Natl. Herb. 16: 127. 1913; Descurainia pinnata var. glabra (Wooton & Standley) Shinners

Plants eglandular, not canescent. Stems unbranched basally, branched distally. Racemes: rachis glabrous, eglandular. Fruiting pedicels divaricate to horizontal or descending, forming 70-90(-100)º angle, 4-10(-15) mm. Flowers: sepals rose (at least apically), 0.8-1.5 mm; petals 1-1.8 × 0.3-0.7 mm.

Flowering Feb-Apr(-Jun). Sandy washes and beds, scrub and bush communities, granitic sand, under junipers, oak and pine woodlands, stream beds, sagebrush, floodplains, limestone outcrops; 300-2400 m; Ariz., Calif., Nev., N.Mex., Utah; Mexico (Baja California, Chihuahua, Coahuila, Hidalgo, Sonora).