Azolla microphylla Kaulf., Enum. Filic.: 273. 1824 sec. Mickel & Smith 2004
Holotype: United States of America, California, Chamisso SN (LE?)
- =Azolla mexicana C. Presl, Abh. Königl. Böhm. Ges. Wiss. ser. 5, 3: 580. 1845, isonym syn. sec. Mickel & Smith 2004