734 ORDER 155. CYPERACE^E. 



drie; spikes 3 to 5-flowered, with a broad rachis and distinctly 4.-angled; glumes 

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

 Baldw'iu.) 



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, ioose clusters, thzir sheaths 3-bristled; involucels or setaceous; 

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

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

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



ft. SPECIOSCS. Umbel compound, the partial umbels with leaf-like involucels. 

 (C. speciosus Yahl.) 



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

 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. X. 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 

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

 membranaceous on tho 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 11-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; 

 spikelsts 3 11 ', oblong-linear, obtuse, 15 25-flowered; fls. very regularly imbri- 

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

 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 base; Ivs. numerous, 

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

 short, teretish, acute, 3 to 6-flowered, i:i dense, globular heads ; glumes striate, 

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

 nume'rous fibres. Plant very leafy. Spikes 2 to 5 ' long, with a broad rachis. 

 (C. Baldwinii Torr. Mariscus, E1L) 



20 C. Grayii Torr. Culm 812' high, filiform, obtusely triangular, erect, tuberous 

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

 spreading; sheaths truncate; hds. loose, of 6 8 spikelets; spikekls 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 Yahl. Culm slender, almost filiform, tuberous at base, 812' lonjr, 

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

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

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

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



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

 umbel sessile cr simpb and few-rayed, rays spreading; ppikes lanceolate, 2-edged, 



