Plants: medium-sized, sometimes small or large. Stems: pinnate or irregularly pinnate. Stem: leaves strongly falcate-secund, rarely weakly so, ovate, broadly ovate, or triangular-ovate, gradually narrowed to apex, ± strongly concave, 1.4â5.2 à 0.4â1.4 mm; base erect or erectopatent, insertion slightly curved; margins entire or weakly and obtusely denticulate; apex acuminate, acumen gradually differentiated, mostly furrowed; costa single, ending beyond mid leaf, mostly in acumen but not excurrent; alar region quadrate or transversely short-triangular, reaching from margin 40â60% distance to costa; ratio of medial laminal cell length (µm) to leaf length (mm) 23.3â36.5. Sexual: condition dioicous. Habitat: Intermediately mineral-rich, meso- to eutrophic habitats, submerged in lakes, pools, ox-bow lakes, terrestrial wetland habitats, fens Elevation: low to high elevations Distribution: Greenland, Alta., B.C., Nfld. and Labr. (Nfld.), N.W.T., N.S., Nunavut, Ont., Yukon, Alaska, Calif., Ind., Iowa, Mass., Mich., Minn., Nev., N.J., N.Y., Okla., R.I., Wash., Wis., Mexico, Central America, South America, Eurasia.
Discussion: Drepanocladus sordidus and 7. D. latinervis are recognized by their almost always strongly falcate leaves, relatively small alar groups, and relatively strong, non-excurrent costae; for differences between the two species, see the discussion of the latter.