31. Boechera fernaldiana (Rollins) W. A. Weber, Phytologia. 51: 370. 1982.
Arabis fernaldiana Rollins, Rhodora 43: 430, fig. 3. 1941; A. canescens Nuttall var. stylosa S. Watson; A. fernaldiana var. stylosa (S. Watson) Rollins
Perennials; long-lived; (ces-pitose); sexual; caudex somewhat woody (sometimes with persistent, crowded leaf bases). Stems usually 1 per caudex branch, arising from center of rosette, near ground surface or slightly elevated on woody base, 1-3.8 dm, densely pubescent proximally, trichomes short-stalked, 4-8-rayed, 0.04-0.1 mm, sometimes mixed with stalked, 2-rayed ones, to 0.5 mm, usually sparsely pubescent distally. Basal leaves: blade narrowly oblanceolate, 1-4 mm wide, margins entire, ciliate along petiole, trichomes (simple), to 1 mm, surfaces densely pubescent, trichomes short-stalked, 4-8-rayed, 0.04-0.1 mm. Cauline leaves: 5-10, not concealing stem; blade auricles 0.3-2 mm, surfaces of distalmost leaves usually sparsely pubescent. Racemes 10-20-flowered, usually unbranched. Fruiting pedicels divaricate-ascending, straight, 5-20 mm, sparsely pubescent, trichomes appressed, branched. Flowers ascending at anthesis; sepals (purplish or greenish) glabrous or sparsely or moderately pubescent; petals white or purple to lavender, 7-12 × 1.5-4 mm, glabrous; pollen ellipsoid. Fruits divaricate-ascending, not appressed to rachis, not secund, straight or curved, edges parallel, 3.5-6.5(-7.5) cm × 1-1.6 mm; valves glabrous; ovules 30-72 per ovary; style 0.1-1 mm. Seeds uniseriate, 1-1.2 × 0.8-1 mm; wing continuous, ca. 0.1 mm wide.
Subspecies 2 (2 in the flora): w United States.
