ScirpuS' TEIANDRIA MONOGYNIAo 221 



mination of tlie culm, which is erect and about as long as the \xxa- 

 he\.— Scales chaff}-, daggered. — Stigma two-cleft. — tiectarial bris- 

 tles two on each side of the germ they are beautifully pinnate and 

 permaueiit.— /Seecf obovate, compressed, smooth, brown^ embraced 

 by the nectarial bristles. 



18. S. pentagonus. R. 



Cul/iiSy from six to nine inches high, somewhat five-sided. Umbel 

 terminal, compouiid ; involucre chaffy ; jiowers monandrous. Seed 

 ol ovate, triangular. 



A native of pasture ground. 



Root fibrous.- — Culms erect, from six to nine inches high, naked, 

 somewhat five-sided, slightly striated, otherwise smooth. — Leaves 

 no other than a sheath or two. — Umbel terminal, compound, small, 

 erect. — Intolucre, a few small chaffy scales, with long tapering points. 

 — Stamens single. — Stigma three-cleft. — Seed somewhat three-sid- 

 ed, white, scabrous. * 



Sect. 9.d. With leaves. 



ig. S. atropnrpureiis. Linn. Sp- PL ed. Willd. i. 294. 



Grows in small tufts. Cvlms from three to four inches high, seta- 

 ceous, erect, culumnar, longer than the leaves. Spikes terminal, nak- 

 ed, solitary, oval. 



A native of poor, wet sandy, pasture land. 



20. S. minimus. R. 



Grows in tufts. Culms from one to two inches long, setaceous, 

 curved, shorter than the leaves. Lrcolucre three-leaved. Spikes 

 terminal, globular, squarrose, about as long as the involucre. 



Found with S. atropiirpuTeus en poor, wet sandy lands. 



21. S. monostachyos. Kan, 



Culms straight, from six to twelve inches long, culumnar. Spike 

 terminal, solitaiy, naked, scales roundish. Seed obcordate, smooth. 

 Delights in barren, sandy pasture lands. 



