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

13. Boechera consanguinea (Greene) Windham & Al-Shehbaz, Harvard Pap. Bot. 11: 261. 2007.

Arabis consanguinea Greene, Pittonia 4: 190. 1900; A. holboellii Hornemann var. consanguinea (Greene) G. A. Mulligan

Biennials or perennials; short-lived; apomictic; caudex present or absent. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 1.5-5 dm, densely pubescent proximally, trichomes short-stalked, 2-6-rayed, 0.2-0.5 mm, glabrous or sparsely pubescent distally. Basal leaves: blade oblanceolate, 2-10 mm wide, margins usually dentate, sometimes ciliate near petiole base, trichomes (usually spurred), to 0.7 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 4-8-rayed, 0.1-0.4 mm. Cauline leaves: 15-36, sometimes concealing stem proximally; blade auricles 1-3 mm, surfaces of distalmost leaves sparsely pubescent. Racemes 20-55-flowered, usually unbranched. Fruiting pedicels reflexed to divaricate-descending, usually curved downward, 8-14 mm, usually pubescent, rarely glabrous, trichomes subappressed, branched. Flowers divaricate-descending at anthesis; sepals pubescent; petals pale lavender, 5-8.5 × 1-2 mm, glabrous; pollen spheroid. Fruits reflexed to pendent, rarely appressed to rachis, not secund, straight or slightly curved, edges parallel, 4-6 cm × 1-2 mm; valves glabrous; ovules 100-128 per ovary; style 0.05-0.5 mm. Seeds biseriate to sub-biseriate, mature seeds not seen.

Flowering May. Rocky slopes and sandy soil in ponderosa pine, pinyon-juniper, and sagebrush communities; 1900-2500 m; Colo., N.Mex., Utah.

Morphological evidence suggests that Boechera consanguinea is an apomictic species that arose through hybridization between B. fendleri and B. retrofracta. It is most similar to B. goodrichii, another apomictic hybrid involving B. retrofracta (see M. D. Windham and I. A. Al-Shehbaz 2007 for detailed comparison).


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