Arabis fecunda Rollins, Contr. Gray Herb. 214: 1. 1984

Perennials; usually long-lived; sexual; caudex often woody. Stems 1 to several per caudex branch, arising from center and margin of rosette, slightly elevated on woody base or from near ground surface, 0.8-3 dm, densely pubescent throughout, trichomes short-stalked, 5-10-rayed, 0.1-0.2 mm. Basal leaves: blade linear-oblanceolate, 1-5 mm wide, margins entire or with few teeth subapically, not ciliate, surfaces densely pubescent, trichomes short-stalked, 5-10-rayed, 0.1-0.2 mm. Cauline leaves: 5-18, concealing stem proximally; blade auricles 0.5-2.5 mm, surfaces of distalmost leaves densely pubescent. Racemes 8-35-flowered, usually unbranched. Fruiting pedicels erect to ascending, straight, 5-15 mm, pubescent, trichomes appressed, branched. Flowers erect to ascending at anthesis; sepals pubescent; petals purplish, 8-12 × 2.5-4.5 mm; pollen ellipsoid. Fruits erect to ascending, often appressed to rachis, not secund, straight, edges parallel, 3-5.8 cm × 1.4-1.8 mm; valves densely pubescent throughout; ovules 34-68 per ovary; style 1-1.5 mm. Seeds uniseriate, 1-1.5 × 0.8-1.2 mm; wing continuous, 0.5-0.1 mm wide.

Flowering Apr-Jun. Rocky ground in sagebrush areas; of conservation concern; 1200-1800 m; Mont.

Boechera fecunda is a distinctive sexual species known from Ravali and Silver Bow counties.

Boechera fecunda is in the Center for Plant Conservation’s National Collection of Endangered Plants.