Woodland Draba

A variable species; differs from Draba muralis L. by its long pedicels, subdentate leaves and fruits with many, very small seeds.

Annual, 5-25 (-40) cm tall, erect, simple or branched mostly from the base, leafy. Basal leaves rosulate, oblong-obovate, 8-35 mm long, 3-15 mm broad, obtuse, remotely dentate to subentire, sessile; cauline leaves 0-few, distant, oblong-ovate, 5-25 mm long, 2.5-12 mm broad, sessile, acute, 3-6-dentate; all leaves ± hirsute with simple and branched hairs. Racemes many flowered, ebracteate, up to 25 cm long in fruit. Flowers c. 2 mm across, pale yellow; pedicels 5-10 mm long, increasing up to 25 mm in fruit, filiform, spreading. Sepals c. 1.5 mm long. Petals c. 2 mm long, apex sub-emarginate. Stamens c. 1.5: 1.7 mm long. Siliculae oblong-elliptic, 5-8 mm long, 2-2.5 mm broad, ± hairy with short, simple and branched hairs; stigma minute, almost sessile; septum not veined; seeds 10-18 in each locule, c. 0.7 mm long, ovoid, brown.

Herbs annual, (3-)6-45(-60) cm tall. Stems erect to ascending, simple or branched a little above base, densely pubescent with a mixture of simple (to 1.3 mm), forked, and stalked or subsessile stellate trichomes, glabrous from proximal flower to apex. Basal leaves rosulate, often persistent through flowering or fruiting; petiole obsolete; leaf blade oblong-obovate or oblanceolate, (0.4-)1-3.5(-5) × (0.2-)0.5-1.5(-2) cm, sparsely or densely pubescent with stalked, forked and stellate trichomes with simple rays, base cuneate, margin dentate or denticulate, rarely subentire, apex obtuse. Cauline leaves (2 or)3-12(-15), sessile; leaf blade broadly ovate to oblong, (0.2-)0.5-1.8(-2.7) cm × (1-)3-10(-15) mm, abaxially pubescent as basal leaves; adaxially pubescent with primarily simple trichomes mixed with fewer forked ones, base cuneate to rounded, margin dentate or denticulate, apex obtuse or acute. Racemes (15-)25-60(-90)-flowered, ebracteate, elongated slightly or considerably in fruit. Fruiting pedicels 0.7-2.5(-3) cm, divaricate, straight, glabrous, filiform, longer than fruits. Sepals ovate, (0.7-)0.9-1.6 × 0.5-1 mm, suberect, abaxially sparsely pubescent with simple trichomes, base of lateral pair not saccate, margin not membranous. Petals yellow, spatulate, (1.2-)1.7-2.2(-2.5) × (0.4-)0.6-1 mm, apex emarginate; claw absent. Filaments (0.9-)1-1.7(-2) mm; anthers broadly ovate to subreniform, 0.1-0.2 mm. Ovules (30-)36-60(-72) per ovary. Fruit oblong or elliptic, (3-)5-8(-10) × 1.5-2.5 mm, slightly latiseptate, not twisted; valves glabrous or puberulent with simple, antrorse trichomes 0.05-0.2 mm, base and apex obtuse, often with a distinct midvein and anastomosing lateral veins; style obsolete, rarely to 0.1 mm. Seeds reddish brown, ovate, 0.5-0.7(-0.8) × 0.3-0.4(-0.5) mm. Fl. and fr. Mar-Jun. 2n = 16.

Distribution: Widespread in most of the Arctic and Temperate Europe and Asia.

Anhui, Gansu, Guizhou, Hebei, Henan, Heilongjiang, Jiangsu, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Xinjiang, Xizang, Yunnan, Zhejiang [Afghanistan, Japan, Kashmir, Korea, Kazakhstan, Kyrgyzstan, Mongolia, Russia, Tajikistan, Turkmenistan, Uzbekistan; SW Asia, Europe, North America].

Fl. Per.: May -July.

Grassy areas, roadsides, wet valleys, river banks, forest margins, streamsides, mountain slopes; near sea level to 4800 m.

Draba nemoralis Ehrhart; D. nemorosa var. brevisilicula Zapalowicz; D. nemorosa var. hebecarpa Lindblom; D. nemorosa var. leiocarpa Lindblom.

Draba nemorosa is a species of flowering plant belonging to the family Brassicaceae.

Its native range is Subarctic and Temperate Northern Hemisphere.