46 TRIANDRIA. MONOGYNIA. scmpus. 



Hab. Borders of ponds ; generally partly under water. June— = 

 July. 



Differs a little from the S.acicularis of Europe, particularly 

 in having much more slender culms and bristles at the base of 

 the seed. In some specimens of S. acicularis from Europe, 

 I have found, occasionally, one or two bristles at the base of the 

 seed. S. trichoidea et exigua of Humboldt and Bon- 

 pland ^VQ not very distinct from this species. 



6. S. ptisillus Vahll: culm compressed and a little 

 angular ; spike ovate, compressed ; seed obovate ; stamens 3 ; 

 style 2— 3-cleft. Elliott Sk. I. p. 75. Vahl Enum. 

 11. p. 246 ? 



Cufm erect, about an inch high, slightly furrowed on one side, 

 rigid Tubercle crowning the seed conic. Bristles about 6. 



Hab. In salt marshes; growing in large patches like mosSo 

 July — August. 



7. S. intermeclius M u h L: culms cegpitose, quadrangularj 

 sulcate ; spike ovate-oblong, acute; giumes rather acute; 

 stamens 3 ; style 2-cIeft; seed broad-obovate, compressed; 

 tubercle distinct. Muhl. Gram. p. 31. 



Boot creeping. Culm slender, ascending, 3 or 4 inches long. 

 Spikes a little variable in length ; sometimes appearing bifid 

 by the divarication of the lower glumes on one side. Glumes 

 dark brown, with green sides. Bristles 6, longer than the seed. 

 Tubercle very minute, conic, distinct from the seed, which is 

 generally of a greenish colour. 



Hab On the muddy and overflowed banks of rivers; sometimes 

 in sandy swamps. Not rare in the vicinity of New-York. 

 Near Dcevfiekl, Massachusetts. Coo ley. In Pennsylvania. 

 Muhlenberg. September. 



8. S. planifolius Muhl.: culm triquetrous; radical 

 leaves linear, flat, nearly equalling the culm ; spike terminal, 

 oblong, compressed, shorter than the cuspidate bracts at the 

 base. Muhl. Gram. p. 32. 



Boot a tuft of large fibres. Culms cespitose, about a span high, 

 acutely triangular, scabrous on the angles. Leaves carinate, 

 margins scabrous, the lower ones shorter and broader. Spike 

 at first lanceolate, about 6- flowered; glumes ovate, mucronate, 

 yellowish; the 2 lowest ones bracteiform, unequal ; the exte- 

 rior one longer than the spike. Stamens 3. Style deeply 

 3-cleft ; stigmas long and glandular. Bristles 4, rather longer 

 than the triangular seed. 



Hab. In wet woods, and in bogs. Deerfield, Massachusetts. 

 Hitchcock and Cooley. In the western parts of the 

 State of New-York. Stevenson. In Pennsylvania and 

 Delaware. Mu h lent erg. May — June. 



