4.1. Pontederia azurea Sw., Prodr. 57. 1788.

Eichhornia azurea (Sw.) Kunth, Enum. Pl. 4: 129. 1843.

Piaropus azureus (Sw.) Raf., Fl. Tellur. 2: 81. 1837. Type. JAMAICA. s.loc., s.dat., Brown s.n. (holotype: S No. S-R-5196!).

Distribution.

Widespread in the American continent from Mexico to Uruguay.