Draba stenocarpa Hook.f. & Thomson

Draba species are dwarf perennial or sometimes annual or biennial herbs. Rootstocks taproot, sometimes woody. Trichomes simple, forked, mixed, stalked or sessile. Stem erect, scapose or leafy, simple or branched pubescent and rarely glabrous. Basal leaves simple, usually in rosulate, obovate to spathulate, margin entire or shortly dentate, ciliate, apex acute to obtuse, petiole short to sessile, cauline leaves when present, base amplexicaul, margins ciliate or entire or shallow dentate, petiole sessile or subsessile. Inflorescence racemes, few to many flowered, elongated or not in fruit, bracteate or ebracteate. Flowers bisexual, yellow, white, purplish, pink, orange, actinomorphic, pedicel erect, ascending, divaricate, sepals 4, subequal, erect, ovate-oblong, margin membranous, inner ones broadly ovate, outer ones longer, lateral pair base rarely saccate, apex blunt or obtuse, petals 4, obovate-orbicular or spathulate, base cuneate, margin entire, apex obtuse or subemarginate, claw strongly differentiated. Stamens 6, tetradynamous, filaments dilated or not, linear and broadened towards the base, anthers oblong-ovoid, nectar glands 2 to 4, confluent and subtending bases of stamens, joining to form horse-shoe shape structure, lateral glands annular or semiannular, median glands usually absent. Ovary superior, linear, ellipsoid-cylindrical, sessile, bicarpellary, syncarpous, ovules 4 to numerous, style distinct, stigma bilobed. Fruit silicles or rarely siliqua, dehiscent, linear-ellipsoid to ovoid-suborbicular, terete, latiseptate, valves flat to subconvex, veins distinct, replum rounded, septum complete, surface glabrous or puberulent. Seeds 5-20, biseriate, compressed, brown, ovate-ovoid, not winged, minutely reticulate, not mucilaginous when soaked, cotyledons accumbent.

Draba species flowers are complete, bisexual, i.e., with functional male (androecium) and female (gynoecium), including stamens, carpels and ovary. Pollination is entomophilous i.e., by insects, or cleistogamy i.e., by self or allogamy i.e., by cross pollination. Flowering/Fruiting: May—July/June—August.

Seeds may be dispersed by autochory i.e., self dispersal, anemochory i.e., wind dispersal, zoochory i.e., dispersal by birds or animals, anthropochory i.e., dispersal by humans.

Erect annual or biennial herbs, about 5-40 cm tall. Rootstock slender, taproot. Stem simple or sparsely branched from the base, stout, slender, usually with cauline 2-5 leaves above the base, us or densely pubescent near the base with simple trichomes or rarely with mixed, usually glabrous from middle towards the apex. Basal leaves simple in rosulate, oblong-elliptic to oblanceolate-obovate, about 8-25 x 2-8 mm across, base cuneate to shallow attenuate, margin entire ciliate or subdentate, apex acute, strigose or pubescent with simple trichomes and few stalked trichomes above, densely pilose with long stalked 3-4 rayed, stellate trichomes beneath, petiole subsessile, cauline leaves about 2-5, almost similar to basal leaves but smaller, lanceolate-oblong to ovate, about 5-18 x 1.5-5 mm across, base cuneate, margin minutely 1-3 dentate rarely entire, apex subacute to obtuse, sparsely pubescent above with simple trichomes, pubescent beneath with mixed simple and forked, furcated or stellate trichomes, petiole sessile. Inflorescence racemes, 10-50 flowered, rachis almost straight, considerably elongated in fruit, ebracteate. Flowers bisexual, yellow, pedicels filiform, erect or slightly curved, ascending, divaricate, glabrous, about 5-12 mm long, about 7-22 mm long in fruit, sepals 4, subequal, erect, elliptic-oblong, margin narrow membranous, lateral pair base not saccate, apex obtuse, glabrous above, hairy beneath, about 1.5-2 mm long, petals 4, spathulate, base cuneate, margin entire, apex subemarginate, about 3-4 x 1-1.5 mm across. Stamens 6, tetradynamous, about 2 mm long, filaments linear and broadened towards the base, anthers oblong, about 0.2-0.3 mm long. Ovary superior, linear, ovules 32-48. Fruit silicles or rarely siliqua, dehiscent, linear, not inflated, latiseptate, flat or compressed, about 10-18 x 1.5-2.5 mm across, base and apex acute or subobtuse, style about 0.1-0.2 mm long. Seeds 14-22, biseriate, brown, ovate-ovoid, about 1 mm, not winged, minutely reticulate.

Draba species are susceptible to insect pests, virus, mildews and moulds.

Subtropical to temperate forests, altitude 3700 m.

Not evaluated (IUCN).