Azolla microphylla Kaulfuss. Section: Azolla. Mexican Mosquito Fern. Phen: Jul-Oct. Hab: Stagnant fresh waters. Dist: Mostly w. North America (east to the Mississippi River areas of MN and WI south to AR and w. TN; also e. and s. TX); Mexico to South America.

Origin/Endemic status: Native

Synonymy: = AqW, K3, Mex, TxFerns, Reid, Plunkett, & Peters (2006); = Azolla cristata Kaulf. – Evrard & Van Hove (2004); < Azolla cristata Kaulf. – K4; > Azolla mexicana C.Presl – Ar, ETx1, FNA2, GrPl, Il, Meso1, Mo1, Tx; > Azolla microphylla Kaulf. – Meso1

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: OBL (taxonomic split from wetland indicator species)
• Great Plains: OBL (taxonomic split from wetland indicator species)
• Midwest: OBL (taxonomic lump from wetland indicator species)
• Northcentral & Northeast: OBL (taxonomic lump from wetland indicator species)

Heliophily: 7