Boechera nevadensis
Harvard Pap. Bot. 11: 73. 2006.
Perennials; short- to long-lived; sexual; caudex usually not woody. Stems usually 2–4 per caudex branch, arising from center of rosette near ground surface, or arising laterally proximal to sterile shoots, 0.6–2 dm, glabrous throughout. Basal leaves: blade oblanceolate, 2–6 mm wide, margins entire, rarely ciliate along petiole, trichomes (simple), 0.5–0.7 mm, surfaces glabrous. Cauline leaves: 5–9, rarely concealing stem proximally; blade auricles 0.7–2.5 mm, surfaces of distalmost leaves glabrous. Racemes 4–12-flowered, usually unbranched. Fruiting pedicels divaricate-ascending to horizontal, straight, 2.5–8 mm, glabrous. Flowers ascending at anthesis; sepals glabrous; petals lavender, 4–5.5 × 1.5–2 mm, glabrous; pollen ellipsoid. Fruits usually divaricate-ascending, rarely slightly descending, usually secund, straight to slightly curved, 1.9–4 cm × 2–3 mm; valves glabrous; ovules 52–72 per ovary; style 0.05–0.2 mm. Seeds biseriate, 1.1–1.4 × 0.8–1 mm; wing continuous, 0.07–0.15 mm wide.
Phenology: Flowering Jun.
Habitat: Ledges and talus of limestone cliffs
Elevation: 3000-3400 m
Discussion
Boechera nevadensis usually is treated as a synonym of Arabis pendulina (R. C. Rollins 1993) or B. demissa (N. H. Holmgren 2005b), but is amply distinct from both (see M. D. Windham and I. A. Al-Shehbaz 2006 for detailed comparison). It is known only from Clark and Nye counties.
Selected References
None.