15. Boechera covillei (Greene) Windham & Al-Shehbaz, Harvard Pap. Bot. 12: 237. 2007; Arabis covillei Greene, Repert. Sp. Nov. Regni Veg. 5: 243. 1908. TYPE: United States, California, Tulare Co., near the lake on the trail to the White Chief Mine, 1000 ft above Mineral King, 6 Aug 1891, F. V. Coville & F. Funston 1492 (lectotype designated by Rollins (1941: 474), US!; isolectotypes, GH!, K!, NY!).
Arabis leibergii Greene, Repert. Sp. Nov. Regni Veg. 5: 243. 1908. TYPE: United States, Oregon, Lake Co., Grayhart Buttes [Gearheart Mt.], 2420 m, 7 Aug 1896, F. V. Coville & J. B. Leiberg 262 (holotype, US!).
Plants long-lived 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, 0.5–2.5 dm, glabrous throughout. Leaves at stem bases oblanceolate, 1.5–5.0 mm wide, entire, ciliate proximally with simple trichomes to 0.4 mm and distally with short-stalked 2–3(–4)-rayed trichomes 0.15–0.40 mm, blade surfaces glabrous; cauline leaves 2–7, not concealing stem, the uppermost glabrous, with auricles 0.2–1 mm or rarely lacking. Inflorescences unbranched, 2–9-flowered; fruiting pedicels 6–20 mm, ascending to suberect, straight, glabrous. Flowers ascending at anthesis; sepals glabrous; petals lavender to purplish, 5–6 ´ 1–2 mm, glabrous; ovules 18–30 per fruit. Fruits 3.5–5.0 cm ´ 3–5 mm, ascending to suberect, rarely appressed to rachises, not secund, straight, with slightly undulate (rarely parallel) edges, glabrous; style 0.2–1.0 mm. Seeds uniseriate, 4–5 ´ 3–4 mm; wing continuous, 1.0–1.5 mm wide.
Habitat: rocky slopes in alpine meadows and open coniferous forests.
Elevation: 2200–3500 m.
Distribution: United States (California, Nevada, Oregon).
Reproductive mode: apomictic triploid.