21. Boechera dispar (M. E. Jones) Al-Shehbaz, Novon 13: 384. 2003; Arabis dispar M. E. Jones, Contr. W. Bot. 8: 41. 1898. TYPE: United States, California, Inyo Co., Panamint Mts., Pleasant Canyon, 5500 ft., 6 May 1897, M. E. Jones s.n. (holotype, POM!; isotypes, MO!, POM!, US!, UTC).
Arabis juniperina M. E. Jones, Contr. W. Bot. 15: 68. 1929. TYPE: United States, Cactus Flat in Cushebury Canyon, 12 May 1926, M. E. Jones, POM!).
Arabis nardina Greene, Leafl. Bot. Observ. Crit. 2: 70. 1910. TYPE: United States, California, Inyo Co., Mill Canyon, Panamint Mts., near Willow Creek, 1950 to 2300 m, 20 May 1891, F. V. Coville & F. Funston 776 (holotype, US!; isotype, GH!).
Arabis salubris M. E. Jones, Contr. W. Bot. 14: 37. 1912. TYPE: United States, California, not located.
Plants mostly long-lived perennials, often with woody caudices, lacking crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 0.9–3.0 dm, lower parts with abundant, short-stalked, 5–12-rayed trichomes 0.1–0.3 mm, upper parts sparsely pubescent to glabrescent. Leaves at stem bases linear-oblanceolate, 2–5 mm wide, entire, not ciliate, blade surfaces densely pubescent with short-stalked, 5–12(–16)-rayed trichomes 0.1–0.3 mm; cauline leaves 1–5, not concealing stem, the uppermost pubescent, without auricles. Inflorescences unbranched, 4–15(–20)-flowered; fruiting pedicels 4–15(–25) mm, ascending, straight, with appressed, branched trichomes. Flowers ascending at anthesis; sepals pubescent; petals purple to lavender, 5–6 ´ 1.0–1.5 mm, glabrous; ovules 44–52 per fruit. Fruits 4.0–7.3 cm ´ 2.7–4.0 mm, divaricate-ascending, not appressed to rachises, not secund, straight, with parallel edges, glabrous; style 0.05–0.10 mm. Seeds uniseriate, 1.9–2.3 mm in diam.; wing continuous, 0.3–0.5 mm wide.
Habitat: rocky slopes and gravelly soil in desert scrub and pinyon-juniper communities.
Elevation: 1450–2300 m.
Distribution: United States (E California/ Inyo, Mono, and San Bernardino counties; Nevada/Nye County).
Reproductive mode: sexual diploid.