sciBPUs. TRIANDRIA. MONOGYNIA. 49 



Hab. In ponds and marshes on the borders of lakes and rivers. 

 June. 



The plant here described differs from the S. lacustris of 

 Europe, in having a 2-cleft instead of a S-cleft style, and in its 

 ciliate glumes. I have, however, seen specimens of S. iacus- 

 tria from Connecticut, in wrhich the style was 3-cleft. The 

 fianicle varies greatly in size ; sometimes it is much decom- 

 pound, frequently somewhat sessile. 



14. S. acutus MuhL: culm terete, (not attenuated,) 

 •potted ; peduncles numerous, sublateral ; spikes oblong ; 

 glumes pubescent, mucronate. MuhL Gram. p. 33. B i g, 

 °Bost. p. 1 5 .? 



Culm 4 feet high, of nearly uniform diameter throughout, co- 

 vered with oblong brown spots. Panicle or cyme proliferous ; 

 peduncles compressed, bracteate at the divisions. Glumes 

 brown, ovate, carinate, dilated. Stamens 3. Style 2-cleft. 

 Seed as in the preceding species. 



Hab. In ponds and wet swamps. Litchfield, Connecticut. 

 Brace. Pennsylvania. Muhlenberg. June — July. 



15. S. atrovirens MuhL: culm triangular, leafy ; cyme 

 terminal, compound, proliferous ; involucrum 3-Ieaved ; spikes 

 conglomerate, ovate, acute ; glumes ovate, mucronate, pu- 

 bescent. MuhL Gram. p. 43. Willd, Enum. h. BeroL 

 1. p. 79. Roem, ir Schult. II. p. 143. 



Culm obtusely triangular, about 2 feet high. Involucrum foli- 

 aceous, longer than the cyme. S/iikes crowded into small 

 heads of 10 or 12 each, about a line and a half long. Glumes 

 dark green, becoming brownish, terminating in a distinct point. 

 Stamens 3. Style 3-cleft. Seed white, smooth, plano-convex. 

 Bristles 4, longer than the seed. 



Hab. In wet meadows; common. June — July. Resembles 

 the next species. 



16. S. hrunntus MuhL: culm leafy, obtusely triangular; 

 cyme decompound ; involucrum 3 — 4-leaved ; spikes round- 

 ovate, clustered in heads of about sixes ; glumes ovate, ob- 

 tuse. MuhL Gram. p. 43. S. exaltatus Pursh FL\. 

 p. 56. Elliott Sk. \. ^.^1.- Roem. ^ Schult. IL 

 p. 143. 



Culm 2 — 3 feet high, clothed with sheathing leaves nearly as tall 

 as the cyme. Principal branches of the cyme about 5, com- 

 pressed or angular, unequal, with truncate sheaths at the base. 

 Sfiikes rather larger than in the preceding species. Glume* 

 of a brown colour, carinate. Stamens 3. Style 3-cleft. Seed 

 triquetrous, shining, shorter than the bristles which surround 

 the base. 



Hab. In water, on the borders of ponds and lakes ; rare. In 

 New-Jersey, near New-York. Deerfield, Massachusetts. 



