Specimens examined: Mpio. Othon P. Blanco, Balneario El Palmar, carretera a Alvaro Obregon, 9 Sep 1986, G. Cortes & R. I. Aguilar s.n. (XAL); Mpio. Othon P. Blanco, alrededores del Zool6gico, Chetumal, 3 Apr 1989, G. Cortns s.n. (XAL); Mpio. Othon P. Blanco, en Balneario Palma, a 7 km al S de Ucum, Tellez & Cabrera 1701 (MEXU); Mpio. Othon P. Blanco, El Palmar, orilla del Rio Hondo (limite M6xico-Belice), 33 km al S de Chetumal, Sousa et al. 12351 (MEXU); Mpio. Othon P. Blanco, bajo inundable del Rio Hondo a la altura de Alvaro Obreg6n, a 54 km de Bacalar rumbo a La Union, Lot & Novelo 787 (MEXU).
Salvinia minima differs from S. auriculata Aublet in having the adaxial surface with numerous conical papillae (2-3 mm long) over the entire surface in rows between the main veins, the papillae with four hairs spreading and free at their tips; sporocarps sessile on unbranched, pendent main axis of fertile leaf; and floating leaves orbicular to slightly oblong, wider than long, 0.6-1.5 cm long, 0.5- 2 cm wide. Salvinia auriculata has the adaxial surface with numerous elongate conical papillae over the entire surface in rows between the main veins, the papillae with four hairs joined together at their tips in a darkened knot; sporocarps pe- dunculate on branched axis, the oldest on longest peduncles; and floating leaves orbicular to orbicular-cordate, wider than long (in the sun), 1.5-2 cm long, 1.8- 2.5 cm wide, notched on both ends (Mickel & Beitel, 1988).