Plants medium-sized to large. Stems irregularly and sparsely branched to ± pinnate. Stem leaves erectopatent to spreading, straight or falcate, ovate, broadly ovate, or rounded-triangular, gradually narrowed to apex, concave, (1.3-)1.7-3.5 × 0.6-1(-1.1) mm; base erectopatent to spreading, insertion slightly curved; margins entire or slightly sinuate; apex acuminate, acumen not or gradually differentiated, furrowed; costa single or 2-fid to 1/2-2/3 leaf length, or double and ending before mid leaf; alar region transversely triangular, reaching from margin 66-100% distance to costa; ratio of medial laminal cell length (µm) to leaf length (mm) 25.3-33.3. Sexual condition autoicous. and nutrient-rich wetlands, eutrophic fens, shores, ditches, submerged in pools and lakes, swampy forests; low to high elevations; Greenland; Alta., B.C., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., Que., Sask., Yukon; Alaska, Calif., Colo., Fla., Idaho, Iowa, Maine, Mass., Mich., Minn., Mo., N.H., N.J., N.Y., Ohio, Wash., Wis., Wyo.; West Indies; Central America; South America; Eurasia (including Papua New Guinea); Africa; Pacific Islands (New Zealand); Australia; Antarctica.
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Plants medium-sized to large. Stems irregularly and sparsely branched to ± pinnate. Stem leaves erectopatent to spreading, straight or falcate, ovate, broadly ovate, or rounded-triangular, gradually narrowed to apex, concave, (1.3-)1.7-3.5 x 0.6-1(-1.1) mm; base erectopatent to spreading, insertion slightly curved; margins entire or slightly sinuate; apex acuminate, acumen not or gradually differentiated, furrowed; costa single or 2-fid to 1/2-2/3 leaf length, or double and ending before mid leaf; alar region transversely triangular, reaching from margin 66-100% distance to costa; ratio of medial laminal cell length (µm) to leaf length (mm) 25.3-33.3. Sexual condition autoicous.
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