Eleocharis tuberculosa (Michx.) Roem. & Schult.

Eleocharis tuberculosa (Michx.) R. & S. Syst. Veg 2:152. 1817.
Scirpus tuberculosus Michx. Fl. Bor.-Am. 1 : 30. 1803.
Rhynchospora monostachya Steud. Syn. Cyp. 140. 1855. (New Orleans.)
Chlorocharis tuberculosa Rikli, Jahrb. Wiss. Bot. 27 : 564. 1895.
Eleocharis tuberculosa var. pubnicoensis Fernald, Rhodora 23 : 233. 1922. (Nova Scotia.)
Eleocharis tuberculosa i. retrorsa Svenson, Rhodora 39: 250. 1937. (Massachusetts.)
Eleocharis tuberculosa f. pubnicoensis Svenson, Rhodora 39 : 250. 1937.
Coarse, cespitose plants with short, vertical rootstocks, or often with only soft, fibrous bases; culms flattened, glaucous-green, 1.5-8 dm. high; sheaths stramineous to green, closely appressed, acute at the apex ; spikelets many-flowered, broadly ovoid to ovoid-lanceolate, 5-15 mm. long; scales cartilaginous, stramineous with narrow green midrib and faint to dark brown coloration on the sides; achene body 1.5 mm. long, stramineous to olivaceous, trigonous, deeply cancellate; style-base pallid, mitriform, 1.0-1.5 mm. long, obtuse to acute, often 3-lobed at the base, usually equaling (occasionally exceeding) the achene-body in size; bristles nearly equaling the style-base, light brown to ferrugineous.
Type locality : "Carolina inferiore."
Distribution : Sandy shores, chiefly on the coastal plain : Nova Scotia ; New Hampshire, south and west to Texas ; inland in Alabama, Tennessee, and Arkansas.