Azolla caroliniana Willdenow. Section: Azolla. Phen: Jun-Sep. Hab: Stagnant waters of interdune ponds, limesink ponds, old millponds, beaver ponds, floodplain sloughs, often locally abundant. Dist: Widespread in the se. United States, extending irregularly north (partly from introductions) into s. New England and MN, and south into the tropics.
Origin/Endemic status: Native
Synonymy: = Ar, C, ETx1, F, FNA2, G, Il, K1, Meso1, Mo1, NE, Pa, RAB, S13, Sf, Tn, Tx, TxFerns, Va, Bates & Browne (1981), Bunch & Hayden (2020), Reid, Plunkett, & Peters (2006); < Azolla cristata Kaulf. – K4, NY; < Azolla filiculoides Lam. – WH3, Evrard & Van Hove (2004); < Azolla microphylla Kaulf. – K3