510 CYl'EKACK.K. (sKPr.E lAMII.V.) 



laiucolato, incurved, sjneaiUiif; nt tlic npcx , nut minute, linenr-lanecoluf;, hlcn- 

 dcr-pointeil ; culms slender (•J°-3° high), obtuse-angled or nearly terete ; leaves 

 narrt)w, rigid, rough on the margins near tlie Kuminit. — Low jiinc barrens and 

 margins of i)onds, Florida to North Carolina. Sept IJ. — Culms tumid at the 

 base. I.iavis of the involucre horizontal. Heads light brown. 



22. C. Drvunmondii, Torr Umbd compound, of 4-6 primary rays, 

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

 in a cluster) oblong or oblong-linear, 40- ."iO-flowercd ; scales yellowish, ovate, 

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

 minutely wrinkled; culms (6'-l,'j' high) obtuse-angled, very rough, longer than 

 the narrow leaves. — Sandy swamps. Middle Florida, and westward. Sei>tem- 

 ber. 



* * Uinht'l simple or sessile : spikflifs Innrpohte or linear, compressed: scales 8 -\0- 

 nerved, taperiufj into a loty spraidiny or recurved point : nut oborute-olilong : low 

 tujled anmuds. 



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

 than the 2-3-leaved involucre; spikcleta very numerous in the dusters (green), 

 oblong-linear (2" long), 10-20-flowcred; 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. COnfei'tu.S, Swartz. Umbel of 1-2 short rays or sessile, shorter 

 than the 2-Ieavcd involucre; spikclcts 8-20 in a cluster, lanceolate, 12-20-flow- 

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

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

 dark brown. — South Floridtu November. Spikclets less crowded than in the 

 preceding. 



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

 racltis, forming clusters or heads: joints of the rachis mostly wimjtd: scales rigid, 

 ^-\l-7ierved: stamens 3. 



* Spikelets few in loose clusters. 



2.'). C. filiformis, Swartz. Clusters sessile ; spikelets 6-12, erect, terete, 

 subulate, 6- 12-flowered; scales scattered, appresscd, oblong, mucronate, finely 

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

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

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

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



26. C. COmpresSUS, L. Umbel simple or compound, often sessile, .shorter 

 than the 4-6-leaved involucre; spikclets spreading, linear, flat, 12-30-flowered ; 

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

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

 leaves. — Cultivated grounds, Florida to North Carolina, and westward. July- 

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



