Novon 13: 386. 2003.
Perennials; long-lived; sexual; caudex woody (sometimes with persistent, crowded leaf bases). Stems usually 1 per caudex branch, arising from center of rosette, often elevated above ground surface on woody base, 5–7 dm, glabrous or sparsely pubescent proximally, trichomes short-stalked, 2- or 3-rayed, 0.15–0.4 mm, glabrous or sparsely pubescent distally. Basal leaves: blade narrowly oblanceolate, 3–8 mm wide, margins coarsely dentate, ciliate, trichomes (simple and 2-rayed), to 0.6 mm, surfaces sparsely to densely pubescent, trichomes short-stalked, 2–7-rayed, 0.15–0.4 mm. Cauline leaves: 15–65, concealing stem; blade auricles 1–4 mm, surfaces of distalmost leaves pubescent. Racemes 30–70-flowered, sometimes branched. Fruiting pedicels divaricate-ascending, straight, 10–45 mm, glabrous. Flowers ascending at anthesis; sepals pubescent; petals white or pale lavender, 8–10 × 1.5–2 mm, glabrous; pollen ellipsoid. Fruits divaricate-ascending to horizontal, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, 6–10 cm × 2.5–3 mm; valves glabrous; ovules 170–220 per ovary; style 0.05–0.5 mm. Seeds biseriate, 1.2–1.6 × 0.9–1.2 mm; wing continuous, 0.1–0.2 mm wide.
Phenology: Flowering Feb–Mar.
Habitat: Sea cliff ledges and crevices of volcanic outcrop in chaparral communities
Elevation: 0-100 m
Of conservation concern.
Boechera hoffmannii is a distinctive sexual species that appears to be restricted to Santa Cruz Island in Santa Barbara County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.