90 Boechera rollinsiorum Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 81. 2006. TYPE: United States, Idaho, Blaine County, near road toward Galena Summit, 18.9 miles N of Ketchum, 18 Jun 1979, R. C. Rollins & K. W. Rollins 79281 (holotype, GH!; isotype, E!).

     Plants long-lived perennials, with woody caudices, lacking crowded, persistent leaf bases; sexual, with ellipsoid pollen. Stems usually 3–5 per caudex branch, elevated above ground surface on woody bases, arising from margin of basal rosettes, 1.0–2.5 dm, lower parts with abundant short-stalked, 2–4(–5)-rayed trichomes 0.2–0.4 mm, upper parts moderately to sparsely pubescent. Leaves at stem bases oblanceolate, 3–5 mm wide, entire, ciliate proximally with simple trichomes to 0.6 mm, blade surfaces densely pubescent with short-stalked, 2–4(–5)-rayed trichomes 0.15–0.40 mm; cauline leaves 5–9, not concealing stem, the uppermost sparsely to moderately pubescent, with auricles 0.5–1 mm. Inflorescences mostly unbranched, 5–11-flowered; fruiting pedicels 4–6 mm, descending, straight to slightly recurved, with few appressed, branched trichomes. Flowers divaricate-ascending at anthesis; sepals pubescent; petals pale purple, 6–8 ´ 1.5–2.0 mm; glabrous. Fruits (immature) pendent, not appressed to rachises, not secund, straight, with parallel edges, glabrous. Seeds not seen.

Flowering: Jun.

Habitat: metamorphosed igneous gravel on steep slopes.

Elevation: ca. 2150 m.

Distribution: United States (Idaho).

Reproductive mode: sexual diploid.

Notes: known only from the type locality.