89. Boechera rollei (Rollins) Al-Shehbaz, Novon 13: 389. 2003; Arabis rollei Rollins, Harvard Pap. Bot. 4: 43. 1993. TYPE: United States, California, Siskiyou Co., divide betw. Applegate & Klamath Rivers, Red Butte-Kangaroo Mt.–Lilypad Lake–Towhead Lake area, T47N, R12W, Sec. 13, 5400–5900 ft., 4 Aug 1983, W. E. Rolle 831 (holotype, GH!; isotypes, JEPS!, MO!).
Plants long-lived perennials, with woody caudices, lacking crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems usually 1 per caudex branch, elevated above ground surface on woody bases, arising from center of basal rosettes, 1.5–2.5 dm, glabrous throughout. Leaves at stem bases oblanceolate, 3–8 mm wide, entire, ciliate proximally with simple trichomes 0.2–0.7 mm, blade surfaces glabrous or sparsely pubescent with short-stalked, 2–4-rayed trichomes 0.2–0.4 mm; cauline leaves 6–12, occasionally concealing stem proximally, the uppermost glabrous, with auricles 0.5–2.5 mm. Inflorescences unbranched, 3–7-flowered; fruiting pedicels 4–6 mm, arched, strongly curved proximally, glabrous. Flowers divaricate-ascending at anthesis; sepals glabrous; petals creamy white, 8–11 ´ 2.0–2.5 mm, glabrous; ovules 14–22 per fruit. Fruits 3.5–6.0 cm ´ 2.5–3.5 mm, pendent, not appressed to rachises, not secund, straight to slightly curved, with undulate (non-parallel) edges, glabrous; style 0.5–1.0 mm. Seeds uniseriate, 3–4 ´ 1.5–2.0 mm; wing distal and proximal, 0.3–0.6 mm wide.
Habitat: peridotite rocks on sparsely forested slopes.
Elevation: 1600–1800 m.
Distribution: United States (California/Siskiyou county).
Reproductive mode: sexual diploid.