Wolffiella gladiata (Hegelm.) Hegelm. (synonyms: Wolffiella gladiata var. floridana Donn. Sm., Wolffiella floridana (Donn. Sm.) C. H. Thomps.), commonly referred to as the sword bogmat or mud-midget, is a warm-temperate species in the Lemnaceae. It has more of a southern to southeastern distribution in the United States where it is found in areas having humid growing seasons and mild winters (Gleason & Cronquist 1991; Landolt 1986; Landolt 2000). Throughout its range, the sword bogmat is found partially submersed and free-floating in sheltered stagnant waters of ponds, lakes, marshes, and sloughs. In the Great Lakes region, W. gladiata is quite rare (Landolt 1986) and it is the only one of three Wolffiella species found in the United States (Landolt 2000). In Indiana, it is known from only two historical populations (Deam 1940; Hicks 1937). Because of the age of the records for this species and the lack of confirmation on the continued persistence of these populations of W. gladiata, it is currently considered as being extirpated from the state (Indiana Natural Heritage Data Center 2000).
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