100. Draba sierrae Sharsmith, Madroño. 5: 149. 1940.
Perennials; (cespitose, pulvinate, canescent); caudex branched (covered with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.05-)0.1-0.4 dm, pubescent throughout, trichomes pectinate or 2-4-rayed, 0.1-0.4 mm, and sometimes simple. Basal leaves (densely imbricate); rosulate; sessile; blade oblong, 0.2-0.6(-0.8) cm × 0.7-1.5(-2) mm, margins entire, (sometimes ciliate, trichomes simple, 0.5-1 mm), surfaces densely pubescent with stalked, subdendritic, 7-12-rayed trichomes, 0.2-0.5 mm. Cauline leaves 0. Racemes 2-6(-9)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels divaricate to ascending, straight, 2-5(-7) mm, pubescent as stem. Flowers: sepals oblong, 2.5-3.5 mm, pubescent, (trichomes short-stalked, branched); petals yellow, spatulate, 4-5 × 1.2-1.8 mm; anthers oblong, 0.5-0.7 mm. Fruits lanceolate to elliptic or broadly oblong to ovate-orbicular, often twisted, occasionally plane, flattened, 4-8(-10) × (2-)3-4.5 mm (asymmetric); valves pubescent, trichomes short-stalked, subpectinate, or 2-4-rayed, 0.05-0.3 mm, sometimes with simple ones; ovules 8-14(-16) per ovary; style (0.1-)0.3-0.7(-1) mm. Seeds ovoid, 1.2-1.5 × 0.7-1 mm.
Flowering Jun-Aug. Granite outcrops, rocky slopes; of conservation concern; 3500-3900 m; Calif.
Draba sierrae is known only from the southern Sierra Nevada in east-central California (Inyo and Fresno counties).