358 ORDER 154. CYPERACEJ5. 



3 C. miorodonttis Torr. Calm and Ivs. slender; spk. numerous, crowded, linear 



acute ; glumes acute, close ; stamens 2 ; achenia oblong, grey^ dotted, (I) South. 

 ft. txalcsii. Culm and leaves filiform ; spikes fewer, loose in the umbel. S-W. 



4 C. flavesccns L. Culm and leaves 410' ; rays 2-4, short, the linear obtuse 



spikes clustered at the end ; glumes obtuse, straw-yellow ; achenia shining. E. 



5 C. flavicomus MX. Culm 1 3f; involucre 3-5-leaved, very long; umbel somo 



compound; spikes numerous, linear, 12-30-flowered, spreading; glumes very obtuse, 

 brownish-yellow, 3-veined, white-edged ; achenia obovate, blackish. Va., and South. 



6 C. artic Hiatus L. Culm 2 6f, the joints internal, leaves or mere sheaths; 



umbel compound, involucre short ; spk. subulate ; gls. 1420, scarious. Swamps, S, 



7 C. erytlirorlmzos Muhl. Culm 2 3f; umbel compound, each ray with several 



sessile clusters ; spikes very many, 6", teretish; glumes 1530, yellow-brown ; inner 

 scales very narrow ; achenia 3-angled, light colored, minute. Pa., S. and W. 



8 C. Inflexus Muhl. Culms clustered, 13', leaves setaceous; hds, 1 3; spk. very 



short (1 2"), crowded ; gls. 810, with a recurved bristle-point. Shores. Com. 



9 C. acumiimtus Torr. Culm filiform or slender, 312'; hds. 17, each of Go flat 



obi. -ovate obtuse spikes 2 3" long ; glumes whitish, recurved at tip. (T) 111. to La. 

 IOC. virens iMx. Culm sharply rough-angled, 1 4f ; leaves keeled, 1 3f ; heads Go, 

 of cc ovate 15-flwd. spikes ; gls. greenish, merely acute ; ach. linear, it Va., and S. 

 ft. reg?t#, has smooth culms and spikes very densely packed. S. 



11 C. Drummoudii Torr. Culm very rough, 6 15', obtuse-angled ; hds. CO, dense, 

 spike oblong-linear, 40-50-flowered, yellowish ; glumes ovate, acute. Swamps. Fla. 



12 C. Haspan L. ft. lepto*. Culm 1 2f, leaves shorter, involucre 2-leaved, shorter 

 than the compound umbel ; spikes linear, acute, 6'', 3 5 in a cluster ; glumes miuute, 

 20 40, mucronate. tawny-brown ; achenia very minute, white, tumid. Swauips. S. 



1 3 C. den tat us Torr. Much like C. Haspan, but the involucre is 3- or 1-leaved, and 

 longer than the umbel ; glumes fewer (720), larger, the upper often long-pointed. 



14 C. Lecoutii Torr. Culm and leaves 1 2f ; umbel much compounded, with about 

 3 oblong, obtuse, flat silvery spikes on each peduncle ; glumes 20 40, obtuse, very 

 closely imbricated. if. Sandy coasts, Fla. A handsome sedge. 



1 5 C. fuscus L. Culms 36', leaves flat ; spk. lance-linear, 1 3", dark-red or brown, 

 densely fascicled in many heads ; glumes round-ovate, closely imbricate. Pliila. 



16 C. coin press us L. Culm tumid at base, 4 10', Ivs. shorter; spikes lance-linear, 

 in loose hds ; gls. 12 40, ov. -acuminate, acutely keeled and close-pressed. Pa., and S. 



17 C, divergens Kunth. Tufts 2 3 r , leaves longer; spikes lance-ovate, flat, acute, 

 1", 6-flowered, white, all in a single somewhat compound head. Fla. 



18 C. filiculmis Vahl. Culm tuberous, very slender, 6 12'; leaves very narrow, 

 keeled; spk. lance-lin., in 14 dense hds. ; gls. loose, 3 8, ovate ; ach. gray. if. Dry. 



19 C. Grayli Torr. Differs from No. 18 only in the looser heads of 68 linear spikes, 

 the glumes less scarious and less veiny. if. Mass, to N. J. 



20 C, Sell, \veltiitzii Terr. Culm rough-3-angled, 1 2f; leaves shorter ; umbel sim- 

 ple, rays 4 6, erect ; fls. large, in little spikes arranged close into cylindric-oblong 

 compound spikes, with setaceous bractlets. if. Shores, N. Y. to Ark. 



21 C. rotundusL. ft. Hydra. Nut Grass. Culm 6' 2f, the leaves shorter ; umbel 

 simple, rays 3 or 4, nearly equaling the invol. ; spikes in two rows on the rachis; 

 gls. 14 24, veinless, purple-brown, if. Va., and S. A rank and troublesome weed. 



22 C. ESCUIJ5NTU8. Root producing ovoid tubers as large as chestnuts, eatable when 

 roasted (those of No. 23 very small) ; glumes veiny, yellow-brown, if. Eur. C lit. 



23 C. pliymatodesMuhl. Culm 1 2f, with long Ivs. and invol. ; umbel simple or 

 compound : spk. linear, obtuse ; gls. veiny, 1220, yellowish- 'if. Root creeping. 



24 C. strigosus L. Culm 1 3f; leaves broad-linear ; umbel dense, large, some com- 

 pound ; rays 1 5' ; spikes crowded, flattened, acute ; glumes 8 18, tawny, ovate, 

 acute, veined, much longer than the achenia. if. Damp. Common. 



25 C. stenolepls Torr. Culm H 3f, smooth; leaves stiff, rough; rays 3 8; spikes 

 crowded. G 7" ; glumes 38, lance-linear, spreading; seed slender, dull. U S. 



