Rorippa indica

Rorippa indica, the variableleaf yellowcress, is an annual or short-lived perennial herb in the Brassicaceae family widely distributed across tropical and subtropical Asia from India and Sri Lanka through southern China, Taiwan, Japan, Korea, Indochina, the Malay Archipelago and into northern Australia, and naturalized in parts of the Pacific. It grows in moist disturbed habitats including rice-field margins, ditches, roadsides, riverbanks and cultivated ground from sea level to mid-elevations. The plant produces a slender taproot and erect to ascending, branched, glabrous stems 15 to 50 centimetres tall, often slightly grooved. The leaves are highly variable; basal and lower stem leaves are oblong to obovate in outline and lyrate-pinnatifid with two to six pairs of small lateral lobes and a larger terminal lobe, 3 to 15 centimetres long, while upper leaves are smaller, lanceolate and merely toothed to entire. Small yellow four-petalled flowers about 3 to 4 millimetres across are borne in elongating terminal racemes; the sepals are erect and the petals slightly longer than the sepals. The fruit is a slender, linear, cylindrical silique 1 to 2 centimetres long, often slightly curved, on a spreading pedicel and dehiscent when ripe, releasing many tiny brown seeds.