Rhizomes 0.4-1 mm thick, soft to hard, longer internodes (2-)5-10 mm, scales seldom decaying to fibers. Culms to 0.35 mm wide. Leaves: distal leaf sheaths with or without apical tooth to 0.2 mm. Flowers: perianth bristles sometimes present. Achenes lemon yellow, stramineous, or yellow-green, finely rugulose and usually finely cancellate at 10-20X, with 8-12 (often obscure) depressions in each vertical series. Tubercles as high as wide or sometimes greatly depressed. 2n = 24.