1. Smelowskia alba (Pallas) Regel, Bull. Soc. Imp. Naturalistes Moscou. 34: 208. 1861.
灰白芹叶荠 hui bai jin ye ji
Sisymbrium album Pallas, Reise Russ. Reich. 3: 739. 1776; Hutchinsia alba (Pallas) Bunge; Nasturtium album (Pallas) Sprengel; Smelowskia cinerea C. A. Meyer.
Herbs (5-)15-40(-60) cm tall, canescent basally. Stems branched above, densely pubescent basally with simple trichomes to 2 mm and much smaller dendritic ones, often glabrescent above. Basal leaves with petioles (0.5-)1.5-4 cm, ciliate with simple trichomes; leaf blade 1- or 2-pinnatesect, oblong or ovate in outline, 1.5-6 × 0.7-3 cm; ultimate segments linear-oblong, oblong, or rarely ovate, 1.5-15 × 0.5-3 mm, apex obtuse or subacute. Middle and upper cauline leaves sessile or subsessile, smaller and less divided than basal ones. Inflorescence often branched. Fruiting pedicels divaricate, slender, (5-)7-11(-15) mm, sparsely pubescent with crisped simple trichomes. Sepals ovate, 2-3 × 1-1.5 mm, caducous. Petals white, suborbicular, 3.5-5(-6.5) × 2-3(-5) mm, rounded at apex, abruptly narrowed to claw 1-1.5(-2) mm. Filaments 1.5-3 mm; anthers oblong, 0.7-0.8 mm. Ovules (12-)14-22 per ovary. Fruit linear to linear-ellipsoid, (5-)8-11(-15) × 1-2 mm, narrowly cuneate at both ends; valves with a prominent midvein; gynophore obsolete or to 0.5 mm; septum perforate, with a short midvein distally; style 0.5-1(-1.3) mm. Seeds reddish brown, oblong, 1-1.5 × 0.5-0.7 mm. Fl. Jun-Jul, fr. Jul-Aug.
Rocky crevices. Heilongjiang [Mongolia, Russia (Far East, Siberia)].
The above first record from Heilongjiang is based on Sato 5672 (PE). Records of Smelowskia alba from Xinjiang in FRPS and Fl. Xinjiang. (2(2): 228. 1995) are likely based on misidentified plants of S. calycina. The present authors were unable to find collections of the former species from Xinjiang.