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FNA | Family List | FNA Vol. 22 | Lemnaceae | Lemna

4. Lemna turionifera Landolt, Aquatic Botany. 1: 355, fig. 4g--h. 1975.

Lenticulare turionifère

Roots shorter than 15 cm, tip mostly rounded; sheath not winged. Stipes white, small, often decaying. Fronds floating, 1 or 2--few, coherent in groups, obovate, scarcely gibbous, flat, 1--4 mm, 1--1.5 times as long as wide, margins entire; veins 3, greatest distance between lateral veins near or distal to above middle; papillae distinct on midline of upper surface (apical papilla scarcely larger than others); lower surface often red (more intensely so than on upper), coloring beginning at attachment point of root, upper surface (especially near apex) sometimes with red spots; air spaces to 0.3 mm; turions sometimes present, rootless, olive to brown, 0.8--1.6 mm diam., sinking to bottom. Flowers: ovaries 1-ovulate, utricular scale with narrow opening at apex. Fruits 0.5--0.6 mm, not winged. Seeds with 30--60 indistinct ribs, staying within fruit wall after ripening. 2n = 40, 42 (G), 50, 80.

Flowering (occasional) summer. Mesotrophic to --eutrophic, quiet waters, in continental, temperate regions; 0--3700 m; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon; Ala., Alaska, Ariz., Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Kans., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.Dak., Tex., Utah, Vt., Wash., W. Va., Wis., Wyo.; Mexico (Baja California); Eurasia.

I know of no specimens of Lemna turionifera from Maine, New HampshireSt. Pierre and Miquelon, or from New Jersey, but the species is to be expected there..


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