534 CYPERACE.E. (SEDGE FAMILY.) 



bristly, shorter than the ovate compact spikes ; spikelets linear, acute, 5-8- 

 riowered ; scales linear-lanceolate, acute, involute, spreading, much longer 

 than the obloug-liuear acute dull and minutely pitted nut ; culms smooth 

 (2 D -3 high) ; leaves very rough on the margins, whitish beneath. Swamps 

 and wet places, Florida to North Carolina. August -Sept. Culm rather 

 slender, longer than the leaves. Spikelets 6" -8" long. 



9. C. brunneus, Swartz. Umbel compound, of 4 - 6 rays ; spikes ovate 

 or oblong, dense; spikelets spreading (4" long), linear-lanceolate, S- 10-now- 

 ered, acute; scales oblong-ovate, acute, spreading, 9- 11 -nerved, thrice the 

 length of the oblong-ohovate pointed blackish nut ; culms obtuse-angled, shorter 

 than the (3 -4 long) whitish long-tapering leaves. Sandy shores, South 

 Florida. Oct. 11 Culm 2 -3 high. Leaves rough-edged. Kays 2' -3' 

 long. Spikelets light brown. Joints of the rachis broadly winged. 



10. C. erythrorhizos, Muhl. Umbel 3-12-rayed, shorter than the 

 involucre; spikelets very numerous, narrow-linear, 12-50-flowered; scales 

 minute, oblong-ovate, yellowish and glossy on the sides ; wings of the rachis 

 at length free ; nut oval, compressed-3-angled ; culms obtuse-angled ; leaves 

 pale beneath ; involucels leafy, longer than the spikes. Ponds ami ditches. 

 July -Sept. (Jj Culms i-4 high. Leaves 1"-14" wide. Spikelets 

 2" -8" long. 



11. C. Halei, Torr. Umbel many-rayed ; spikes densely clustered, cylin- 

 drical, -J'-f long, the involucels few and linear; spikelets flat, 12-14- 

 flowered ; scales brown, sharply keeled, 5-nerved ; nut triquetrous ; culms 2 - 

 3 high, round-angled. Marshes, Florida, and westward. 



12. C. dissitiflorus, Torr. Umbel simple, 3 - 4-rayed ; spikelets scat- 

 tered along the upper portion of the slender rays, lanceolate, compressed, 

 acute, 5 - 7-flowered ; scales oblong-lanceolate, acute ; nut obloug-obovate, 

 compressed-triangular ; culms filiform (l-2 high) ; leaves narrow-linear. 

 Mississippi, Tennessee, and westward. 



H- -i- Spikelets terete or angular. 

 *+ Scales closely imbricate : spikelets, short, oblong. 



13. C. tetragonus, Ell. Umbel of 6- 12 slender rays ; spikes cylindri- 

 cal, loose ; spikelets horizontal, short (2"-3" long), 4-augled, 4 - 6-flowered ; 

 scales ovate, 9 - 1 1 -nerved, twice as long as the oblong dull nut ; culms mostly 

 slender, 1-2 C high, as long as the leaves; involucre many-leaved. Dry 

 sanrlv soil, along the coast, Florida to North Carolina. August- Sept. 2/ 

 Spikes l'-H' long, 5" wide, those on the longer rays commonly compound. 

 Rays 3' -5' long. 



14. C. ligularis, L. Umbel many-rayed; spikes compact, cylindrical, 

 compound, pale ; spikelets short (2" -3" long), spreading, nearly terete, 7- 

 flowered ; scales thin, ovate, acute, 7-nerved, twice the length of the obovate 

 triangular acute nut ; rachis broadly winged; culms stout, nearly terete (2- 

 3 high), glaucous, like the broadly linear rough-edged leaves. Wet sandy 

 places, Punta Rassa, South Florida.. 



+) Scales rather distant : spikelets linear. 



15. C. speciosus, Vahl. Umbel 4 - 6-rayed ; spikes loose, mostly shorter 

 than the leafy iuvolucels ; spikelets spreading or reflexed, linear-subulate, 



