Floating Marshpennywort

Hydrocotyle ranunculoides L. f. Suppl. 177. 1781
Hydrocotyle americana Walt. Fl. Car. 113. 1788. Not H. americana L. 1753. Hydrocotyle nutans Cirillo, PI. Rar. Neap. 1: 20. 1788. Hydrocotyle cvmbalarifolia Muhl. Cat. 30. 1813. Hydrocotyle b'atrachioides DC. Prodr. 4: 667. 1830.
Hydrocotyle adoensis Hochst.; Hoppe & Fiirnrohr. Flora 24': Intell. 28. 1841. Hydrocotyle ranunculoides a genuina Urban in Mart. Fl. Bras. II 1 : 284. 1879. Hydrocotyle ranunculoides i natans Urban in Mart. Fl. Bras. II 1 : 284. 1879. Hydrocotyle ranunculoides var. lobata Urban in Mart. Fl. Bras. II 1 : 283. 1879. Hydrocotyle ranunculoides var. inciso-crenata Urban in Mart. Fl. Bras. II 1 : 284. 1879. Hydrocotyle ranunculoides /3 adoensis Urban in Mart. Fl. Bras. II 1 : 284. 1879. Hydrocotyle ranunculoides y brasiliensis Urban in Mart. Fl. Bras. II 1 : 284. 1879. Hydrocotyle ranunculodes [sic] f. minima Ktintze, Rev. Gen. 3 3 : 114. 1898.
Stems slender to somewhat fleshy, floating or creeping; leaves not peltate, roundishreniform with a sinus at the base, excluding the petioles 5-80 mm. long, 5-80 mm. broad, 5-6-lobed about to the middle, the lobes crenate or lobulate, glabrous; petioles mostly slender, 1-34.5 cm. long, glabrous; peduncles shorter than the leaves, axillary, 4-60 mm. long, glabrous; umbels simple, 5-10-flowered; pedicels 1-3 mm. long, spreading and ascending; stylopodium depressed; fruit suborbicular, 1-3 mm. long, 2-3 mm. broad, the dorsal surface rounded, the ribs obsolete; strengthening cells absent.
Type locality: Mexico, Mutis.
Distribution: Pennsylvania and Delaware to Florida, west to Arkansas, Texas, and Arizona; Washington, south along the coast to Panama; Cuba; also in South America. (Curtiss 5888, Elmer 4657.)