t 

 734 ORDER 155. CYPERACE^E. 



dric; spikes 3 to 5-flowered, with a broad rachis and distinctly ^-angled; glumes 

 slightly mucronate ; ach. oblong, 3-angled. Marshes, S. Car. to Ma. (Elliott. 

 Baldwin.) , 



13 C. strigosus L. Culm triquetrous, leafy only at base ; Ivs. broad-linear, rough- 

 margined, about as long as the stem ; umbel some compound, with elongated rays 

 and oblong, loose clusters, their sheaths 3-brwtkd; involucels or setaceous; 

 spikelets numerous, linear-subulate, spreading horizontally, 8 10-flowered, 7 9" 

 long; in vol. of about 6 leaves, the 2 outer ones very long. "Wet grounds, U. S., 

 frequent. Stem 1 2f high, bulbous at base. Umbel yellowish. Sept. 



P. SPECIOSUS. Umbel compound, the partial umbels with leaf-like involucels. 

 (C. speciosus Vahl.) 



14 C. stenolepis Torr. Culm 2 to 3f high, slender, 3-angled; umbel simple, of 3 

 or 4 elongated rays ; invol. 3 or 4-leaved ; ochrece (sheaths) truncate, pointless ; 

 spikes crowded, spreading or reflexed, linear, flattened, 5 to 8-flowered, in ovoid 

 clusters; glumes distant, lance-linear, veined; ach. linear-oblong. N. Car. to Ga. 

 and Tenn. Spikes 6 to 8" long, of a dusky yellow. 



15 C. Schweinitzii Torr. Culm 8 12' high, triquetrous, rough on the angles; Ivs. 

 shorter than the stem, about a line wide ; umbel simple, erect, 4 6-rayed, rays 

 elongated, unequal ; sheaths truncate, entire ; invoL 3 5-leaved, longer than the 

 leaves, scabrous on the margin ; spikelets 6 7, alternate, approximate, in cylindric 

 clusters, 6 8-flowered, with a small, setaceous bract at the base of each; scales 

 membranaceous on the margin ; sta. 3 ; sty. 3-cleft, scarcely longer than the 

 smooth achenia. Shore of L. Ontario (Sartwell) of Lake Erie (Sullivant) to Ark. 



16 C. inflexus Muhl. Culm setaceous, leafy at base. 2 3' high ; Ivs. equaling 

 the stem ; umbel 2 3-rayed, or conglomerate and simple ; invol. of 3 long leaves ; 

 spikelets oblong, 8 12-flowered, 10 20 together, densely crowded into the ovoid 

 heads; glumes yellowish, veined, squarrous-uncinate at tip; sta. 1. Banks of 

 streams. Free States and British Provinces. Aug., Sept. 



17 C. acuminatus Torr. & Hook. Culm 3 to 12' high, slender, obtusely trique- 

 trous; Ivs. erect, radical, as long as the stem; umbel 1 6-rayed; invol. 3- 4- 

 leaved, very long; rays unequal, each with a globous head of 15 40 spikelets; 

 spikelets 3 11", oblong-linear, obtuse, 15 1^ -flower ed ; fls. very regularly imbri- 

 cated in 2 rows; glumes acute, with the point recurved; sta. 1 ; ach. dull-gray ish. 

 111. (Mead.) and westward. 



18 C. virens MX. Culm 2 to 4f high, stout, 3-angled; Ivs. nearly as long, 

 strongly keeled, rough-edged ; umbel compound, with 5 to 7 very unequal rays ; 

 invol. of 4 or more leaves, very long, involucels leafy ; spikes ovate, in dense, 

 globular heads, flattened, 10 to 20-flowered; glumes acute, greenish; stam. 1; 

 ach. 3-angled, acute at each end. Swamps, S. States. Spikes 3 to 5'' long. Nut 

 dull yellow. (C. vegetus Ell. Torr.) 



19 C. echinatus. Culm 10' to 2f high, 3-angled, bulbous at baso; Ivs. numerous, 

 rather shorter; invol. 6 to 10-leavcd, long; umbel simple, 6 to 10-rayed; spikes 

 short, teretish, acute, 3 to G-flowered, in dense, globular heads; glumes striate, 

 tawny, appressed; stam. 3; ach. obovate. Dry fields, S. States. Root with 

 numerous fibres. Plant very leafy. Spikes 2 to 5'' long, with a broad rachin. 

 (C. Baldwinii Torr. Mariscus, E1L) 



20 C. Grayii Torr. Culm 8 12' high, filiform, obtusely triangular, erect, tuberous 

 at base; Ivs. radical, channeled, about " wide; umbel 4 Q-rayed capillary, erect, 

 spreading; sheaths truncate; hds. loose, of 6 8 spikelets; spikde.ts linear, com- 

 pressed, 8 7-flowered; scales ovate, veined, obtuse, imbricated, interior ones 

 lanceolate; sta. 3; sty. 3-cleft; ach. obovate-triquetrous, the length of the scale, 

 gray, dotted. Sandy fields, Mass, to N. J. Sept. 



21 C. filiculmis VahL Culm slender, almost filiform, tuberous at base, 8 12' long, 

 leafy only at base ; Ivs. mostly radical, carinate ; umbel simple and sessile, or with 

 I or 2 rays; spikes linear- lanceolate, 3 8-flowered, flattened when old, collected 

 into globous heads ; glumes remote, loose, ovate, yellowish. Dry, rocky hills, N. 

 Eng. to Fla., W. to 111. Aug. (C. mariscoides Ell.) 



22 C. compressus L. Culm naked, 3-angled, 3 to 8' high, tumid at base; 

 umbel sessile or simple and few-rayed, rays spreading; spikes lanceolate, 2 -edged, 



