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Perennial herb, 0.10-0.75 m high. Stems stout, sometimes branched in lower parts. Leaves: basal leaves rosulate, not present at flowering time, petiolate, lyrate-pinnatifid, 4-7(-9)-jugate; lower cauline leaves shortly petiolate, oblanceolate or lanceolate, pinnatifid with lobes reduced to teeth, upper ones sessile, lanceolate or linear-lanceolate, margins dentate or entire. Inflorescence a terminal raceme. Petals obovate, cuneate or clawed, bright yellow. Fruit a siliqua, linear-oblong, valves reticulately veined.
An annual herb. It grows in or near water. The stems can be 40 cm tall. The stems are stout and often branched in the lower parts. The leaves at the base are in a ring. The upper leaves are 10 cm long by 2.5 cm wide. The flowering shoots are at the ends of the stems with a dense group of flowers. The fruiting pod can be 5 cm long and 2-5 mm wide.
