83. Boechera pygmaea (Rollins) Al-Shehbaz, Novon 13: 388. 2003; Arabis pygmaea Rollins, Rhodora 43: 476. 1941. TYPE: United States, California, Tulare Co., Basin of the Upper Kern River at Volcano Meadows (originally known as Whitney Meadows, 8500 ft, 21 Jul 1904, H. M. Hall & H. D. Babcock 5465 (holotype, GH!; isotypes, E!, MO!, NY!, OSC!, US!).
Plants mostly long-lived perennials, with woody caudices, often with crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems usually 2–5 per caudex branch, arising near ground surface from margin of basal rosettes or laterally below sterile shoots, 2–8 cm, lower parts with simple and short-stalked, 2–3-rayed trichomes to 0.4 mm, upper parts glabrescent. Leaves at stem bases linear, 0.8–1.5 mm wide, entire, ciliate with simple and spurred trichomes to 0.8 mm, blade surfaces moderately pubescent with short-stalked, 2–4-rayed trichomes 0.05–0.40 mm; cauline leaves 2–4, not concealing stem, the uppermost pubescent, lacking auricles. Inflorescences unbranched, 2–5-flowered; fruiting pedicels 2–7 mm, erect to ascending, straight, with subappressed, branched trichomes or rarely glabrous. Flowers erect at anthesis; sepals pubescent; petals white, 3.5–5.0 ´ 0.7–1.0 mm, glabrous; ovules 8–12 per fruit. Fruits 1.3–3.3 cm ´ 4–5 mm, erect to ascending, often appressed to rachises, not secund, straight, with parallel edges, glabrous; style 0.05–0.40 mm. Seeds uniseriate, 3–5 ´ 2.5–4.5 mm; wing continuous, 0.8–2.0 mm wide distally.
Habitat: barren flats of arkosic gravel.
Elevation: 2400–3200 m.
Distribution: United States (California/Inyo and Tulare counties).
Reproductive mode: sexual diploid.