79. Boechera pratincola (Greene) Windham & Al-Shehbaz, Harvard Pap. Bot. 12: 245. 2007; Arabis pratincola Greene, Repert. Sp. Nov. Regni Veg. 5: 244. 1908; A. drummondii A. Gray var. pratincola (Greene) M. Hopkins, Rhodora 39: 142. 1937. TYPE: United States, Nevada, Douglas Co., Spooner, common in wet meadows, 2155 m, 23 Jun 1902, C. F. Baker 1149 (holotype, US!; isotypes, GH!, MO!, NDG!, NY!, ORE!, POM!, UC!).
Arabis nemophila Greene, Leafl. Bot. Observ. Crit. 2: 78. 1910. TYPE: United States, California. Sequoia National Forest, Jul 1908, A. Davidson 1847 (holotype, US!).
Plants mostly short-lived perennials, with non-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, 2–6 dm, lower parts with sessile, 2–3-rayed trichomes 0.15–0.60 mm, upper parts glabrous. Leaves at stem bases oblanceolate, 1.5–5(–7) mm wide, entire or rarely denticulate, ciliate at petiole base with trichomes to 0.4 mm, blade surfaces with sessile, 2–4(–6)-rayed trichomes 0.10–0.45 mm; cauline leaves (7–)13–42, concealing stem proximally, the uppermost sparsely pubescent apically, with auricles 1–4 mm. Inflorescences mostly unbranched, (7–)14–45-flowered; fruiting pedicels 5–12 mm, erect, straight, glabrous. Flowers ascending at anthesis; sepals glabrous; petals lavender, 6–10 ´ 1.5–2 mm, glabrous; ovules 60–140 per fruit. Fruits 4–6.5 cm ´ 1.5–2 mm, erect, appressed to rachis, not secund, straight, with parallel edges, glabrous; style 0.1–0.3 mm. Seeds subbiseriate, 1.4–2.0 ´ 1.0–1.4 mm; wing continuous, 0.10–0.35 mm wide.
Habitat: rocky slopes and soil patches in open areas and along forest edges.
Elevation: 1900–3200 m.
Distribution: United States (California, Idaho, Nevada, Oregon).
Reproductive mode: apomictic triploid.