510 CYPERACE.E. (SEDGE FAMILY.) 



lanceolate, incurved, spreading at the apex ', nut minute, linear-lanceolate, slen- 

 der-pointed ; culms slender (2 -3 high), obtuse-angled or nearly terete ; leaves 

 narrow, rigid, rough on the margins near the summit. Low pine barrens and 

 margins of ponds, Florida to North Carolina. Sept. 1J. Culms tumid at the 

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



22. C. Drummondii, Torr. Umbel compound, of 4 - 6 primary rays, 

 and as many smaller ones, shorter than the 4-leaved involucre ; spikelets (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 (6' -15' high) obtuse-angled, very rough, longer than 

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

 ber. 



* * Umbel simple or sessile : spikelets lanceolate or linear, compressed: scales 8- 10- 

 ncrved, tapering into a long spreading or recurved point : nut obovate-oblong : low 

 tufted 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-leaved involucre; spikelets 8-20 in a cluster, lanceolate, 12-20-flow- 

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

 culms acute-angled (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 rachis mostly winged: scales rigid, 

 5-1 l-nerved: stamens 3. 



* Spikelets few in loose clusters. 



25. C. filiformis, Swartz. Clusters sessile ; spikelets 6-12, erect, terete, 

 subulate, 6-12-flowered; scales scattered, appressed, oblong, mucrpnate, finely 

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

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

 one elongated and erect. Key West. November. 1J. Culms 4' - 10' high, 

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



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

 than the 4 - 6-leaved involucre ; spikelets spreading, linear, flat, 1 2 - 30-flowered ; 

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

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

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

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



