Apiospermum obcordatum Klotzsch, nom. illeg. superfl.; Pistia obcordata Schleiden, nom. illeg. superfl.

Morphological characters are the same as those of the genus. Plants aquatic, floating. Roots many, pendulous in water, feathery. Leaves in rosettes, 1.3-10 × 1.5-6 cm. Spathe white, 5-12 mm. Fl. May-Nov.

The plants are cultivated for animal feed and are used to treat swelling and urinary tract infections.

Water fields, lakes, ponds. Fujian, Guangdong, Guangxi, Taiwan, Yunnan; cultivated in Anhui, Hubei, Hunan, Jiangsu, Jiangxi, Shandong, Sichuan [tropical and subtropical regions worldwide].