Thlaspi prolixum A. Nelson; T. stipitatum A. Nelson

Stems (0.6-)0.8-2.2(-2.8) dm. Basal leaves: petiole differ-entiated from blade, (0.6-)0.9-2.2(-3.3) times longer than blade; blade ovate to oblong, (3.5-)6-16(-20) mm wide, base cuneate. Cauline leaves (4-) 7-16(-21). Racemes often compact. Fruiting pedicels horizontal or slightly descending, forming an angle 80º or more with rachis. Flowers: petals pinkish purple or, occasionally, white, (6-)6.5-11(-13) × (1.5-)2-4 (-5) mm. Fruits often winged, obovate to obcordate, 7-12(-16) × (4-)4.5-6(-9) mm, 1-2 times as long as wide, apex truncate to emarginate; style (1.8-)2.5-3.5 (-4.2) mm. Seeds 4-6 per fruit. 2n = 14.

Flowering Mar-Jun. Shady areas on slopes, in canyons and gulches, igneous rocky ravines, steep banks, woods; 1300-2100 m; Ariz., N.Mex., Tex.

R. C. Rollins (1966, 1993) recorded a tetraploid count of 2n = 28 from Hinsdale County, Colorado, but subsp. fendleri does not occur in that state, and his count is based on plants of subsp. glauca.