Eleocharis acutangula subsp. acutangula

Widespread in Africa; also in Madagascar, Asia, Australia and South and Central America

Eleocharis fistulosa (Poir.) Schultes in R. & S Syst. Veg. Mant. 2 : 89. 1824.
Scirpus fistitlosiis Poir. in Lam. Encyc. 6: 749. 1804.
Scirpus acutangulus Roxb. El. Ind. 1 : 213. 1820. (India.)
Scirpus medius Roxb. El. Ind. 1 : 213. 1820. (India.)
Baeothryon fistulostim A. Dietr. Sp. PI. 2: 94. 1833.
Limnochloa acutangula Nees in Wight, Contr. Bot. Ind. 114. 1834.
Limnochloa media Nees in Wight, Contr. Bot. Ind. 114. 1834.
Limnochloa obtnsetrigona Lindl. & Nees; Nees in Mart. El. Bras. 2^: 100. 1842. (Brazil.)
Eleocharis planiculmis Steud. Syn. Cyp. 80. 1855. (Java.)
Eleocharis obhisetrigona Steud. Syn. Cyp. 80. 1855.
Eleocharis mutata var. obtnsetrigona Clarke, Bull. Herb. Boiss. 6 (Append. 1) : 20. 1898.
Culms sharply triangular, coarse, 4-6 dm. high; roots coarse, reddish-brown; sheaths brown, membranous, rather loose, pointed at the summit; spikelets 1.5-3.5 cm. long, cylindric, acute; scales 4 mm. long, straw-colored or gray, broadly -ovate, obtuse or somewhat acute, firm, striate, the margins erose but not conspicuously membranous ; style trifid ; stamens 3; achene 2-2.4 mm. long (including the style-base), obovate, turgid, green or light brown, rough, with about 20 rows of deeply pitted quadrangular cells, the apex narrowed to a neck about one-half the width of the achene, broadening again to form the base of the triangular style ; bristles coarse, usually exceeding the achene, firmly toothed.
Type locality : Madagascar.
Distribution: Eresh to brackish water: Texas {Runyon) ; Cuba; Mexico; Guatemala; Panama ; Old and New World tropics.