2K) TRIANDRIA MONOGYNIA. . SchptfS. 



S. cariboeus. Rottb. gram. 4(5. /. 15./1 3. 



A native of barren, sandy, moist places. 



Root fibrous. Culms erect, from four to eight inches high, 

 round, smooth, naked. Leaves no other than a sheath or two. 

 Spike terminal, naked, sub globular; permanent bristles sur- 

 round the genu in this species, as in those with single termi- 

 nal, cylindric spikes. Style two-cleft. Seed obcordate, com- 

 pressed, smooth, shining- black. 



12. S. juncoides. R. 



Culms from one to three feet high, culumnar. Spikes oval, 

 from three to five in a sessile head, far below the apex. Seed 

 roundish, beset with bristles. 



A native of wet and marshy places. 



Root fibrous. Culms erect, from one to three feet high, na- 

 ked, round, and slender in proportion to the height, striated, 

 otherwise smooth. Leaves none, except iwo sheaths embrac- 

 ing the base of each culm. Spikes- from three to five, lateral, 

 sessile, oval, naked, from four to six inches, below the apex 

 of the culm, which is erect, and like that below the spikes. 

 Involucre none. Stamens three, intermixed with bristles. Stig- 

 ma two-cleft. Seed obcordate, compressed, smooth, white. 



13. S. mueronatus. Linn. sp. pi. ed. Willd. i. 303. Vcthf. 

 enum. ii. 256. 



Culms from six to twelve inches high, three-cornered. 

 Spikes peduncled and sessile below the apex. Seed black, 

 scabrous, sub-triangular. 



A native of sandy ground. 



Root fibrous. Culms erect, from six to twelve inches high, 

 firm, naked, three-sided, striated, with rounded angles, above 

 the spikes half round, with a groove on the flat side. Spikes, 

 lateral, sessile and peduncled, naked, from six to twelve, ob- 

 long, many-flowered. Nectarial bristles of the germ want- 

 ing. Seed somewhat three-sided, black, with scabrous spots. 



