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

55. Boechera lincolnensis Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 71. 2006.

Arabis pulchra M. E. Jones ex S. Watson var. munciensis M. E. Jones; Boechera pulchra (M. E. Jones ex S. Watson) W. A. Weber var. munciensis (M. E. Jones) Dorn

Perennials; long-lived; sexual; caudex woody. Stems usually 1 per caudex branch, arising from center of leaf tuft, elevated above ground surface on woody base, 2-4.2 dm, densely pubescent proximally, trichomes short-stalked, 3-6-rayed, 0.1-0.5 mm, similarly pubescent distally. Basal leaves: blade linear or linear-oblanceolate, 1-2 mm wide, margins entire, rarely ciliate near petiole base, trichomes (simple), to 1 mm, surfaces densely pubescent, trichomes short-stalked, 3-8-rayed, 0.1-0.4 mm. Cauline leaves: 10-25, concealing stem proximally; blade auricles absent or, rarely, to 1 mm, surfaces of distalmost leaves densely pubescent. Racemes 7-15-flowered, usually unbranched. Fruiting pedicels divaricate-ascending, straight to slightly curved proximally, recurved distally, 10-20(-25) mm, pubescent, trichomes appressed, branched. Flowers divaricate-ascending at anthesis; sepals pubescent; petals lavender to purple, 10-12 × 2-3 mm, glabrous or sparsely pubescent (occasionally some trichomes abaxially); pollen ellipsoid. Fruits usually widely pendent to ascending, rarely horizontal, not appressed to rachis, not secund, straight, edges parallel, (3.2-)4-5.5 cm × 2-2.5 mm; valves pubescent throughout; ovules 86-120 per ovary; style 0.1-0.3 mm. Seeds biseriate, 1-1.5 × 0.7-0.9 mm; wing continuous, 0.07-0.12 mm wide. 2n = 14.

Flowering Apr-May. Rocky slopes and gravelly soil with sagebrush and other shrubs; 1400-1900 m; Calif., Nev., Utah.

Recent studies suggest that Boechera lincolnensis is a distinct species (see M. D. Windham and I. A. Al-Shehbaz 2006 for detailed comparison).


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