510 CYPERACE^.. (sedge FAMILY.) 



lanccolato, incnn-ed, spreading; at tlie apex , nut minute, linear-lanceolate, slen- 

 dor-pointi.ll ; culms slender {:>°-3° lii>,^h), obtuse-angled or nearly terete ; leaves 

 narrow, rij^id, rough on the margins near the summit. — Low ])ine barrens and 

 margins of jmnds, Florida to North Carolina. Sept. Ij. — Culms tumid at the 

 base. Leaves of the involucre horizontal. Heads light brown. 



22. C. Drummondii, Torr. Umbel compound, of 4-G primary rays, 

 and as many smaller ones, shorter than the 4-leaved involucre ; spikikts (10 20 

 in a cluster) oblong or oblong-linear, 40- 50-flowered; scales yellowish, ovate, 

 straight, free at the apex ; nut oblong, pointed, abruptly contracted at the base, 

 minutely wrinkled; culms (f>'-15' high) obtuse-angled, very rough, longer than 

 the narrow leaves. — Sandy swamps, JMiddlc Florida, and westward. Septem- 

 ber. 



* * Umbel simple or sessile : spilelcts lanceolate or linear, compressed: scales 8- ]0- 

 ncrved, tapering into a long spreading or recurved point : nut obocute-ohloug : low 

 tujled annuals. 



23. C. inflexus, Muhl. Umbel of 1 - 2 short rays or sessile, much shorter 

 than the 2-3-leaved involucre; spikelets very numerous in the clusters (green), 

 oblong-linear (2" long), 10-20-flowered; scales thin, oblong, 8-nerved, gradu- 

 ally pointed; culms weak, acute-angled (2' -6' high), as long as the smooth 

 narrowly linear leaves. — Low sandy places, Apalachicola, Florida, (apparently 

 introduced,) to North Carolina, and northward. July -Sept. — Sheaths of the 

 leaves green. 



24. C. COnfertuS, Swartz. Umbel of 1-2 short rays or sessile, shorter 

 than the 2-Icaved involucre; spikelets 8-20 in a cluster, lanceolate, 12-20-flow- 

 ered, reddish brown (3" long) ; scales rigid, oblong, 10-nerved, abruptly pointed ; 

 culms acutc-anglcd (l'-4'high), as long as the linear smooth leaves; sheaths 

 dark brown. — South Florida. November. Spikelets less crowded than in the 

 preceding. 



5. Capitati. Umbel simple or sessile : spikelets inserted on all sides of the common 

 rachis, forming clusters or heads: Joints of the raclas uiosllij winged: scales rigid, 

 5-ll-nerved: stamens 3. 



* Spikelets few in loose clustiTS. 



2.5. C. filiformis, Swartz. Clusters sessile ; spikelets G- 12, erect, terete, 

 subulate, G- 1 2-flowcrcd ; scales scattered, appressed, oblong, mucronate, finely 

 nerved; rachis very slender, flexuous ; nut oblong, acute ; culms tufted, filiform, 

 acute-angled, longer than the bristle-like leaves; involucre 2-lcnved, tlie lower 

 one elongated and erect. — Key West. November H. — Culms 4' -10' high, 

 tumid at the bsLfc. Spikelets 4" - 6" long. 



2G. C. COmpressUB, L. Umbel simple or compound, often sessile, shorter 

 than the 4-6-leaved involucre; spikelets spreading, linear, flat, 1 2 - .'iO-fiowercd ; 

 scales ovate, acuminate, closely imbricated, keeled , nut broadly obovate, acute- 

 angled, black and shining; culms obtuse-angled, longer than the pale green 

 leaves. — Culfivatod grounds, Florida to North Carolina, and westward. .Tuly- 

 Sept. (i^ — CuluLS 4'- 12' high. Umbel spreading, sometimes reduced to few 



