276 North American Cyperacea. 



C. vegetus, Willd., sp. 1. 283? ; Vahl, enum. 2. p. 326? ; Pursh,fi. 

 1. p. 51; Muhl.! gram. p. 25; Elliot^ sk. 1. p. 65. 



Culm 2 — 4 feet high, the lower part with the sides convex. Leaves 4 

 lines wide, scabrous on the margin towards the summit. Umhel about 

 5-rayed ; the longer rays 2 — 3 inches in length ; partial rays very short, 

 each bearing a head of 10 — 15 spikelets. Involucre much longer than 

 the umbel. Ochrees bifid. Spikelets 3 — 4 lines long, and 2 lines wide, 

 somewhat ancipital. Scales closely imbricated, greenish white, 3-nerved. 

 Stamens always solitary. Style 3-cleft. Nut brown, very narrow, 

 gradually tapering to a sharp point, the short pedicel swollen into a kind 



of bulb. 



• 



Hab. Ponds and ditches. Wilmington, North Carolina, 

 Mr. Curtis;! South Carolina and Georgia; Elliott, Muhlen- 

 berg!; East Florida, Dr. Baldwin! 



Obs. This species greatly resembles C. virens, but it can 

 be distinguished by its smooth, obtusely triangular culm, and 

 long-pointed nut with a remarkable cellular bulbous base. 

 It is probable that our plant is a distinct species from the C 

 vegetus of Vahl and Willdenow. 



ttf Spikelets few, linear, loosely Jlowered, somewhat convex, 

 inserted in an irregular manner towards the summit of the 

 rays; nut nearly as long as the scales, 



30. Cyperus Schweinitzii. 

 Culm triquetrous, with scabrous angles ; umbel simple ; rays 

 elongated ; involucre 3 — 5-leaved ; spikelets 6 — 7, alternate and 

 approximate, somewhat appressed lanceolate, 6 — 8-flowered, 

 with a setaceous bract at the base of each ; scales ovate, acuminate, 

 mucronate, keeled ; rachis margined with the narrow interior 

 scales ; style 3-cleft to the base ; nut triquetrous, ovate, acute. 



C. altemiflorus, SchweinitzJ in Long's 2nd. exped. append. 2. p. 381, 

 (not of JJ. Brown.) 



