91. Boechera rubicundula (Jepson) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 273. 2007; Arabis arcuata (Nuttall) A. Gray var. rubicundula Jepson, Fl. California 2: 69. 1936. TYPE: United States, California, Santa Clara Co., Mt. Day, 21 May 1908, R. J. Smith s.n. (holotype, JEPS!; isotype, RSA!).

     Plants long-lived perennials, with woody caudices, lacking crowded, persistent leaf bases; apomictic, with spheroid pollen. Stems usually 1 per caudex branch, often somewhat elevated above ground surface on woody bases, arising from center of basal rosettes, 1–5 dm, lower parts with abundant simple trichomes 0.5–1.0 mm, these mixed with long-stalked, 2–3-rayed trichomes 0.1–0.5 mm, upper parts moderately to sparsely pubescent. Leaves at stem bases oblanceolate, 4–8 mm wide, denticulate, ciliate on petiole with trichomes to 1 mm, blade surfaces densely pubescent with long-stalked, 2–5-rayed trichomes 0.1–0.5 mm; cauline leaves 8–25, often concealing stem proximally, the uppermost moderately pubescent, with auricles 1–3 mm. Inflorescences mostly unbranched, 12–34-flowered; fruiting pedicels 5–10 mm, divaricate-ascending to horizontal, straight, with spreading, simple or 2-rayed trichomes. Flowers ascending at anthesis; sepals pubescent; petals purplish, 6–8 ´ 2.0–2.5 mm, glabrous; ovules 70–102 per fruit. Fruits 4–8 cm ´ 1.7–2.2 mm, divaricate-ascending to horizontal, not appressed to rachises, not secund, straight or slightly curved, with parallel edges, glabrous; style 0.1–0.3 mm. Seeds uniseriate, 1.4–1.8 ´ 1.0–1.3 mm; wing continuous, 0.1–0.2 mm wide.

Flowering: Apr–May.

Habitat: mountain slopes.

Elevation: ca. 1200 m.

Distribution: United States (California).

Reproductive mode: apomictic triploid.

Note: known only from the type loc