<734 Order 155.— CYPERACEjE. 



dric; S2»kes 3 to 5-ftowered, with a broad rachis and distinctly ^-angled; plumes 

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

 Baldwin.) 



13 C. strigcsus L. Culm triquetrous, leafy only at baso; lvs. broad-linear, rough- 

 margiued, about as long as the stem; umbel some compound, with elongated raj - s 

 and oblong, loose clusters, thdr sheat/is 'i-brislled; involucels or setaceous; 

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

 long; invol. 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. 



ji. si'ECioSUS. Umbel compound, the partial umbels with leaf-like involucels. 

 (C. speciosus Yahl.) 



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

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

 spikes crowded, spreading or reflexed, linear, llattened, 5 to 8-ilowcred, in ovoid 

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

 and Term. Spikes G to 8" long, of a dusky yellow. 



15 C. Schweimtzii Torr. Culm 8 — 12' high, triquetrous, rough on the angles; lvs. 

 shorter than the stem, about a lino wide ; umbel simple, erect, 4 — G-rayed, raya 

 elongated, unequal; sheaths truncate, entire; invol. 3 — 5-leaved, longei than tho 

 leaves, scabrous on tho margin ; spikelets G — 7, alternate, approximate, in cijlindric 

 clusters, G — 8-llowered, with a small, setaceous bract at the base of each ; scales 

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

 smooth achenia. — Shore of L. Ontario (Sartwell) of Lako Eric (Sullivant) to Ark. 



16 C. inflexus Muhl. Culm setaceous, leafy at base. 2 — 3' high ; lvs. 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 tho ovoid 

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

 streams. Froo State3 and British Provinces. Aug., Sept. 



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

 trous; lvs. erect, radical, as long as tho stem; umbel 1 — 6-rayed; invol. 3 — t- 

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

 spikehts 3 — 11", oblong-linear, obtuse, 15 — 25-flowered; lis. very regularly imbri- 

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

 — 111. (Mead.) and westward. 



18 C. virens Mx. Culm 2 to 4f high, stout, 2-angled; lvs. nearly as long, 

 strongly kjeled, 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, llattened, 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; lvs. numerous, 

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

 short, terctish, acute, 3 to G-flowered, ia dense, globular heads ; glumes striate, 

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

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

 (C. Baldwinii Torr. Mariscus, Ell.) 



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

 at base; lvs. radical, channeled, about £" wide; umbel 4 — 6-rayed capillary, erect, 

 spreading; sheatli3 truncato; lids, loose, of G — 8 spikelets; spikelets linear, com- 

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

 lanceolato ; sta. 3 ; sty. 3-cleft ; ach. obovate-triquetrous, § the length of tho scale, 

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



21 C. filiciilmis Vahl. Culm slender, almost filiform, tuberous at base, 8 — 12' long, 

 leafy only at base; lvs. 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. compr6ssus L. Culm naked, 3-angled, 3 to 8' high, tumid at baso; 

 umbel sessile or simple and few-rayed, raya spreading; spikes lanceolate, 2-odgad, 



