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FNA | Family List | FNA Vol. 7 | Brassicaceae | Boechera

80. Boechera pulchra (M. E. Jones ex S. Watson) W. A. Weber, Phytologia. 51: 370. 1982.

Arabis pulchra M. E. Jones ex S. Watson, Proc. Amer. Acad. Arts 22: 468. 1887

Perennials; long-lived; sexual; caudex woody. Stems usually 1 per caudex branch, arising from center of leaf tufts, elevated above ground surface on woody base, (1.5-) 3-7.5 dm, densely pubescent proximally, trichomes short-stalked, usually 4-7-rayed, 0.1-0.3 mm, similarly pubescent distally. Basal leaves: blade linear to linear-oblanceolate, 1-3 mm wide, margins entire, not ciliate, surfaces densely pubescent, trichomes short-stalked, 4-9-rayed, 0.1-0.3 mm. Cauline leaves: 10-30, often concealing stem proximally; blade auricles absent or, rarely, to 0.5 mm, surfaces of distalmost leaves pubescent. Racemes 8-25-flowered, usually unbranched. Fruiting pedicels reflexed, abruptly recurved at base, otherwise straight, 8-16 mm, pubescent, trichomes appressed, branched. Flowers descending at anthesis; sepals pubescent; petals usually purple, rarely white, 9-16 × 2-4(-5) mm, sparsely pubescent or glabrous (trichomes scattered abaxially); pollen ellipsoid. Fruits strongly reflexed, often appressed to rachis, sometimes somewhat secund, straight, edges parallel, 3.3-8 cm × 2.5-4 mm; valves pubescent throughout; ovules 68-106 per ovary; style 0.1-0.3 mm. Seeds biseriate, 1.7-2.8 × 1.5-2.2 mm; wing continuous, 0.25-0.65 mm wide.

Flowering Mar-Jun. Rocky, gravelly or sandy slopes in chaparral, sagebrush and desert scrub communities; 800-2800 m; Calif., Nev.; Mexico (Baja California).

Boechera pulchra is a distinctive diploid separated from related sexual species (B. formosa and B. lincolnensis) by abruptly recurved fruiting pedicels and purple flowers, and from apomictic hybrids (e.g., B. xylopoda) by having fruits densely pubescent throughout.


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