65. Physaria parviflora (Rollins) O’Kane & Al-Shehbaz, Novon. 12: 326. 2002.
Lesquerella parviflora Rollins, J. Arnold Arbor. 64: 506. 1983
Perennials; caudex simple or branched; densely (silvery) pubescent, trichomes (irregularly radiate), 6-8-rayed, rays furcate or bifurcate, fused at base. Stems several from base, prostrate to decumbent, (usually unbranched, rarely branched distally), 1-3 dm. Basal leaves (tufted); blade broadly obovate, 1-2 cm, margins entire or with 1 or 2 broad teeth, (apex rounded to obtuse). Cauline leaves: blade oblanceolate to nearly oblong, similar to basal, (base cuneate), margins entire. Racemes (secund), loose, (elongated in fruit). Fruiting pedicels (recurved), 6-8(-12) mm. Flowers: sepals (yellowish), elliptic to lanceolate, (2-)3-4 mm; petals spatulate, (3.9-)5-7 mm. Fruits (usually pendent), elliptic to subglobose, usually slightly compressed (latiseptate), 3-4 mm; valves densely pubescent, sometimes with scattered trichomes inside; ovules 4 per ovary; style ca. 3 mm. Seeds somewhat flattened.
Flowering Jun-Jul. Shale of steep slopes, rock crevices, ledges, canyon sides, shale-marlstone; of conservation concern; 2100-2700 m; Colo.
Physaria parviflora is known from the Parachute Creek Member of the Green River Formation, Rio Blanco County.