Stems (0.1-)0.5-3.2(-4.5) dm. Basal leaves: petiole differentiated from blade, 0.8-1(-2) times longer than blade; blade ovate to oblong, 4-9(-15) mm wide, base cuneate. Cauline leaves (4-)7-16(-21). Racemes often lax. Fruiting pedicels horizontal to strongly descending, forming an angle to 130º with rachis. Flowers: petals white or, occasionally, pinkish purple, (3.4-)4-7(-8.5) × (1-)1.5-2.7(-4.2) mm. Fruits winged or, occasionally, not winged, obovate to obcordate, (2.5-)5-8(-12) × (1.5-)2.6-4.5(-6.6) mm, 1-2 times as long as wide, apex obtuse, truncate, to emarginate; style (0.4-) 1-2.2(-3) mm. Seeds 4-6 per fruit. 2n = 14, 28.
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