Description from Flora of China
Annuals, (8-)15-30 cm tall, glabrous throughout. Stems erect or subdecumbent, branched. Petiole 0.5-5 cm; leaf blade simple or rarely lowermost trifoliolate, ovate, 1.5-6 × 1-4 cm, base cordate or subtruncate, margin sinuate or repand, with apiculate callosities at vein tips, apex obtuse. Racemes ebracteate; rachis straight. Fruiting pedicels slender, reflexed, (5-)8-12 mm, straight, glabrous. Sepals oblong-ovate, 1.7-2.5 × 0.8-1.1 mm, glabrous, narrowly membranous at margin and apex. Petals white, obovate, 2.5-3 × 1.2-1.7 mm, base shortly clawed, apex rounded. Filaments 1.5-2 mm; anthers 0.4-0.6 mm. Fruit oblong, 6-12 × 1.7-2.3 mm, glabrous; style 0.8-1.5 mm. Seeds (5-)7-14(-21), brown, ovate, 0.8-1.3 mm.
* Forests, mountain slopes, rock crevices, shady moist sand; near sea level to 700 m. Anhui, Guangdong, Hunan, Jiangxi.