51. Physaria macrocarpa (A. Nelson) O’Kane & Al-Shehbaz, Novon. 12: 325. 2002.
Lesquerella macrocarpa A. Nelson, Bot. Gaz. 34: 366. 1902
Perennials; caudex branched; densely pubescent, trichomes (sessile or short-stalked), 4-6 -rayed, rays distinct, usually furcate, rarely bifurcate, (finely tuberculate throughout). Stems few or several from base, pros-trate to decumbent, (unbranched or branched), 0.5-1.5 dm. Basal leaves: blades orbicular to broadly obovate, 1.5-3 cm, margins usually entire, rarely remotely dentate. Cauline leaves (sessile or shortly petiolate); blade elliptic to oblanceolate, 1-1.5(-2.5) cm, margins entire, (apex obtuse). Racemes dense, (elongated in fruit). Fruiting pedicels (sharply recurved), 5-10 mm, (stout). Flowers: sepals ovate or oblong-elliptic, 5-5.5 mm, (lateral pair not saccate); petals cuneate or broadly obovate, ca. 7 mm, (sometimes slightly narrowed to a broad claw, apex sometimes retuse). Fruits subglobose to broadly obovoid, strongly inflated (often slightly angustiseptate), 5-7 mm, (papery); valves sparsely pubescent; (septum fenestrate, perforate, or obsolete); ovules 4-8 per ovary; style 2-3 mm. Seeds somewhat flattened.
Flowering May-Jun. Gypsum-clay hills and benches, naked clay flats and barren hills; of conservation concern; 2000-2400 m; Wyo.
Physaria macrocarpa is found in the Great Divide and Green River basins.