Pycnoplinthus uniflora (Hook. fil. & Thomson) O. E. Schulz

Herbs with slender to stout, apically branched or rarely unbranched caudex to 1.5 cm in diam., glabrous throughout. Petiole (0.3-)0.6-1.7(-2.5) cm, expanded at base, to 4 mm wide, persistent, stramineous, covering caudex and its branches; leaf blade linear, linear-oblanceolate, or linear-lanceolate, rarely oblanceolate, (0.5-)1-2(-2.5) cm × (0.5-)1-2.5 mm, somewhat fleshy, base subattenuate, margin entire, apex obtuse or acute. Fruiting pedicels slender, 1.5-3.5(-4) cm, ascending or strongly recurved, longer than leaves. Calyx 3-4 mm; lobes deltoid-ovate, 1-1.5 × 1-1.5 mm, subacute. Petals white or pink, obovate, 6-8 × 1.8-2.2 mm, apex rounded; claw 2.5-4 mm. Filaments slender, median pairs 2.5-3.5 mm, lateral pair 2-2.5 mm; anthers oblong, 0.6-1.1 mm. Fruit linear or narrowly oblong, (4-)7-11(-13) × 1.5-2.5(-3) mm; valves prominently veined, papery; style 0.3-0.6(-1) mm. Seeds oblong, light brown, 1.2-1.7 × 0.6-1 mm. Fl. Jun-Jul, fr. Jul-Aug.

Gansu, Qinghai, Xinjiang, Xizang [Kashmir].

Wet places, sandy river beds, sandy areas among gravel, wet grassy areas; 3600-5200 m.

Braya uniflora J. D. Hooker & Thomson, J. Proc. Linn. Soc., Bot. 5: 168. 1861; Hesperis uniflora (J. D. Hooker & Thomson) Kuntze; Sisymbrium uniflorum (J. D. Hooker & Thomson) Fournier.