64. Boechera paddoensis (Rollins) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 268. 2007; Arabis lemmonii S. Watson var. paddoensis Rollins, Rhodora 43: 384. 1941. TYPE: United States, Washington, Yakima Co., Mt. Paddo (Mt. Adams), rocks, 6000 or 7000 ft [1818 or 2121 m], 8 Aug 1885, W. N. Suksdorf 509 (holotype, GH!).
Plants long-lived, cespitose perennials with mostly woody caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems 1–3 per caudex branch, arising near ground surface from center of basal rosettes or laterally below sterile shoot, 1.0–2.5 dm, glabrous throughout. Leaves at stem bases narrowly oblanceolate, 1–3(–6) mm wide, entire or rarely few toothed near apices, not ciliate, blade surfaces sparsely pubescent with short-stalked, 4–8-rayed trichomes 0.08–0.20 mm; cauline leaves 4–8, not concealing stem, the uppermost glabrous, with auricles 1–2 mm. Inflorescences mostly unbranched, 5–12(–18)-flowered; fruiting pedicels 2–5(–10) mm, divaricate-ascending or rarely horizontal, straight, glabrous. Flowers ascending at anthesis; sepals glabrous; petals lavender to purple, 4.0–5.5 ´ 1.0–1.5 mm, glabrous; ovules 42–54 per fruit. Fruits 3.0–5.5 cm ´ 1.5–2.0 mm, divaricate-ascending or rarely horizontal, not appressed to rachises, secund (often weakly so), straight, with parallel edges, glabrous; style 0.05–0.1 mm. Seeds uniseriate, 1.1–1.5 ´ 0.9–1.3 mm; wing continuous, 0.1–0.3 mm wide.
Habitat: rocky ridges.
Elevation: 1500–2100 m.
Distribution: United Sates (Oregon, Washington).
Reproductive mode: apomictic triploid.