69. Boechera peirsonii Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 270. 2007. TYPE: United States, California, San Bernardino Co., San Bernardino Mts., rocky ledge above Dollar Lake, 9100 ft [2758 m], 24 Aug 1922, F. W. Peirson 3269 (holotype, RSA!; isotype, CAS!).
Arabis breweri S. Watson var. pecuniaria Rollins, Rhodora 43: 409. 1941. TYPE: United States, California, San Bernardino Co., San Bernardino Mts., Dollar Lake, rocky ledges, 9250 ft [2803 m], 24 Aug 1922, P. A. Munz 6238 (holotype, GH!).
Plants long-lived, cespitose perennials, with woody caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems usually 1 per caudex branch, arising near ground surface from center of basal rosettes, 1.0–2.5 dm, lower parts glabrous or with few short-stalked, 2–5-rayed (rarely a few simple) trichomes 0.4–0.6 mm, upper parts glabrous. Leaves at stem bases oblanceolate, 2.5–6.0 mm wide, entire, ciliate proximally with simple trichomes, blade surfaces densely pubescent with short-stalked, 4–7-rayed trichomes 0.3–0.5 mm; cauline leaves 3–12, often concealing stem proximally, the uppermost glabrous or ciliate, with auricles 0.5–2 mm. Inflorescences mostly unbranched, 12–25-flowered; fruiting pedicels 2–6 mm, ascending to divaricate-descending, straight, glabrous. Flowers ascending at anthesis; sepals pubescent; petals purple, 5–6 ´ 1.5–2.0 mm, glabrous; ovules 56–80 per fruit. Fruits 2.0–3.7 cm ´ 2.0–2.8 mm, ascending to divaricate-ascending, not appressed to rachises, not secund, straight, with parallel edges, glabrous; style 0.1–0.3 mm. Seeds uniseriate, 1.0–1.5 ´ 0.8–1.0 mm; wing distal or continuous, 0.05–0.10 mm wide.
Habitat: granitic ledges and talus slopes.
Elevation: 2700–3350 m.
Distribution: United States (California/San Bernardino County).
Reproductive mode: apomictic triploid.