Boechera hoffmannii

(Munz) Al-Shehbaz
Novon 13: 386. 2003.
Basionym: Arabis maxima var. hoffmannii Munz Bull. S. Calif. Acad. Sci. 31: 63. 1932
Synonyms: Arabis hoffmannii (Munz) Rollins
Treatment appears in FNA Volume 7. Treatment on page 383. Mentioned on page 356, 362, 384.
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Illustrator: Barbara Alongi

Copyright: Flora of North America Association

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

Discussion

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.

Selected References

None.

Lower Taxa

None.