Herbs annual, (5-)10-35(-45) cm tall, glabrous throughout, sometimes sparsely with semiglobose papillae 0.05-0.1 mm. Stems erect or decumbent, branched basally and above, rarely simple. Basal leaves petiolate, rosulate, soon withered, lyrate, pinnatisect, or bipinnatisect, up to 10 × 3 cm, with up to 12 lateral lobes on each side of midvein. Cauline leaves and bracts sessile or rarely petiolate throughout, auriculate or sagittate at base, lyrate, pinnatisect, or bipinnatisect, rarely sinuate or toothed, (0.8-)1.5-5(-7) × (0.3-)0.8-2.3(-3) cm; lateral lobes 2-6(or 7) on each side of midvein, to 10 × 5 mm, incised, dentate, or entire. Racemes bracteate throughout; bracts rarely adnate to pedicel. Fruiting pedicels stout, ascending, (0.3-)0.7-2(-3) mm. Sepals oblong or subelliptic, 1.5-2(-2.5) × 0.5-0.8 mm. Petals pale yellow, obovate or narrowly spatulate, 2-3(-3.5) × 0.5-1 mm. Filaments 1.5-2 mm; anthers oblong, 0.3-0.4 mm. Ovules 100-230 per ovary. Fruit broadly or narrowly oblong, (3-)4.5-8.5(-10) × 1.5-2.5 mm; valves thin papery, veinless; style 0.1-0.5 mm. Seeds reddish brown, ovate or ovate-reniform, foveolate, biseriate, (0.3-)0.4-0.6 × (0.2-)0.3-0.4 mm. Fl. and fr. Feb-Nov.
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An annual herb. It grows 10-40 cm high. The leaves both at the base and on the stems are broadly oval and 2-6 cm long by 1-2 cm wide. They have lobes along the side. The leaves on the stems do not have leaf stalks. The flowers are small and yellow. They occur singly in the axils of the leaves. The pods are 6-8 mm long and 1-2 mm wide. There are many seeds. They are oval and reddish-brown.
It grows in central and eastern China. It grows in wetlands, waysides and on the edges of fields. It grows from near sea level to 1,500 m above sea level. In Sichuan and Yunnan.
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