66. Physaria parvula (Greene) O’Kane & Al-Shehbaz, Novon. 12: 326. 2002.
Lesquerella parvula Greene, Pittonia 4: 308. 1901; L. alpina (Nuttall) S. Watson subsp. parvula (Greene) Rollins & E. A. Shaw; L. alpina var. parvula (Greene) S. L. Welsh & Reveal
Perennials; caudex (buried), usually branched, sometimes simple, (cespitose); densely pubescent, trichomes (appressed), 4-7-rayed, rays distinct, furcate or bifurcate near base. Stems few to several from base, erect, (unbranched, slender), 0.3-1.5 (-3) dm. Basal leaves (tufted, erect); blade linear to very narrowly spatulate, 1-3(-4) cm, margins entire (involute). Cauline leaves similar to basal. Racemes relatively dense. Fruiting pedicels (ascending, curved or sigmoid), 2-10 mm. Flowers: sepals (greenish yellow), elliptic, 3.5-7 mm; petals spatulate, 5-6 mm, (not clawed). Fruits (erect), ovoid (or longer than broad), usually inflated, 4-5 mm, (apex acute, slightly flattened); valves pubescent, trichomes appressed; ovules 4-8 per ovary; style 2-4 mm. Seeds flattened, (mucilaginous). 2n = 10, 20.
Flowering May-Jul. Exposed windblown ridges, gravelly hills, open rocky knolls, gravelly hilltops, clay hillsides, granitic sand, reddish soil, sagebrush, mountain scrub, and pinyon-juniper areas; 1800-2800 m; Colo., Utah, Wyo.