43. Boechera hastatula (Greene) Al-Shehbaz, Novon 13: 386. 2003; Arabis hastatula Greene, Leafl. Bot. Observ. Crit. 2: 79. 1910. TYPE: United States, Oregon, Imnaha National Forest, North of Bald Knob, 600 ft, 25 Jun 1907, A. W. Sampson & G. A. Pearson 64 (holotype, US!).
Plants short- to long-lived perennials, often with woody caudices, lacking crowded, persistent leaf bases; apomictic (with spheroid pollen) or sexual (with ellipsoid pollen). Stems 1–4 per caudex branch, arising near ground surface from margin of basal rosettes, 1–3 dm, glabrous throughout. Leaves at stem bases linear-oblanceolate to oblanceolate, 1–3(–5) mm wide, entire or minutely toothed, rarely ciliate near petiole bases with few simple trichomes to 0.8 mm, blade surfaces pubescent with short-stalked, 3–6-rayed trichomes 0.07–0.20 mm or glabrous; cauline leaves 4–15, not concealing stem, the uppermost glabrous, with auricles 0.5–2.5 mm. Inflorescences mostly unbranched, 12–40-flowered; fruiting pedicels 4–8 mm, reflexed, abruptly recurved near base, glabrous. Flowers divaricate to pendent at anthesis; sepals pubescent; petals lavender, 5–6 ´ ca. 1 mm; glabrous; ovules 46–60 per fruit. Fruits 3.0–4.2 ´ 1.0–1.5 mm, reflexed to closely pendent, usually appressed to rachises, often secund, straight, with parallel edges, glabrous. Seeds uniseriate, 1.0–1.3 ´ 0.8–1.0; wing continuous, 0.05–0.10 mm.
Habitat: igneous rock outcrops.
Distribution: United States (Oregon/Baker and Wallowa counties).
Reproductive mode: apomictic triploid.