Draba ussuriensis Pohle

Draba ussuriensis is very rare in China and is known to the present authors from a few collections made primarily in Changbai Shan, including Hong et al. 32754 (PE). The record in FRPS of D. ussuriensis from China is probably based on misidentified plants of D. mongolica.

Herbs perennial, 3-15 cm tall, loosely cespitose, scapose. Caudex several branched, ultimate branches terminated in rosettes and covered with leaf remains of previous years. Stems erect, simple, sparsely pubescent with stellate trichomes, glabrous distally. Basal leaves rosulate, persistent; petiole to 5 mm, ciliate with simple trichomes; leaf blade oblong-obovate, spatulate, or oblanceolate, 0.6-1.6 cm × 2-4 mm, pubescent with subsessile stellate trichomes 1 or 2 rays of which forked or with a lateral branch, base attenuate, margin entire or 1-3-toothed on each side, ciliate with simple trichomes, apex obtuse to acute. Cauline leaves absent or 1 or 2(or 3), sessile; leaf blade ovate to oblong, 2-9 × 1-3 mm, pubescent as basal leaves, base obtuse, margin entire or 1-3-toothed, apex acute. Racemes 5-17-flowered, ebracteate, elongated in fruit. Fruiting pedicels 4-13 mm, divaricate, straight, slender, glabrous. Sepals ovate-oblong, 1.8-2.5 × 0.9-1.3 mm, erect, abaxially sparsely pubescent, base of lateral pair not saccate, margin not membranous. Petals white, narrowly obovate, (3.5-)4-6 × 2-3 mm, apex subemarginate. Filaments 1.5-2.5 mm; anthers ovate, 0.2-0.3 mm. Ovules 12-16 per ovary. Fruit oblong-ovate to elliptic, 5-8(-10) × 2-2.5 mm, not inflated, latiseptate, not twisted; valves glabrous or pilose, not veined, base and apex acute; style ca. 1 mm. Mature seeds not seen. Fl. and fr. Jul-Aug. 2n = 16, 32.

Jilin [Japan, Russia].

Sunny roadsides, hot springs, alpine moss plains; 2100-2600 m.