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Chinese Plant Names | Family List | Brassicaceae | Draba

Draba jucunda W. W. Smith


Description from Flora of China

Herbs perennial, 2-10 cm tall, densely cespitose, scapose. Caudex many branched, ultimate branches terminated in rosettes and covered with remains of previous years. Stems erect, simple, often densely pubescent with a mixture of simple and fewer, subsessile forked trichomes, rarely subglabrous. Basal leaves rosulate, persistent, sessile; leaf blade elliptic to oblong-oblanceolate, 3-10(-12) × 1.5-4 mm, thickish, sparsely pubescent with simple and rigid, stalked, forked trichomes, rarely with primarily, rigid stellate trichomes abaxially, often subglabrous adaxially except for margins, base cuneate, margin entire, often ciliate with simple trichomes, apex obtuse to acute. Cauline leaves absent. Racemes 2-7(-10)-flowered, ebracteate, elongated in fruit. Fruiting pedicels (2-)5-10(-14) mm, divaricate or divaricate-ascending, straight or rarely slightly curved, tomentose or pilose abaxially, glabrous adaxially. Sepals oblong, 3-4.5 × 1.2-1.8 mm, erect, abaxially glabrous or sparsely pilose with simple trichomes, base of lateral pair subsaccate, margin narrowly membranous. Petals yellow, obovate, 5-7(-8) × 2.5-3.5 mm, apex subemarginate or rounded; claw to 2 mm. Filaments (2-)3-4.5 mm; anthers oblong, 0.6-1 mm. Ovules 8-16 per ovary. Fruit oblong to elliptic or suborbicular, 6-12 × 3-6 mm, latiseptate, slightly twisted or not; valves subhirsute with simple or forked trichomes, sometimes glabrous, not veined, base obtuse, apex subacute; style (1-)1.5-3.5 mm. Seeds brown, ovate, 1.2-1.5 × 0.7-1 mm. Fl. Jun-Aug, fr. Aug-Sep.

The above first record from Xizang is based on Rock 23083 (BM, E, GH, K, NY, US) and Forrest 19280 (E, P), both of which were collected from the vicinity of "Tsarung" (28(40'N, 98(15'E). However, the Forrest specimen at E is a mixed collection of Draba jucunda and D. involucrata.

* Gravely or sandy areas, scree; 3400-4600 m. SE Xizang, NW Yunnan.


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