T34 Obdkb 166.— CYPBRA.OE.ffi. 



cirio; spikes 3 to 6-flowered, with a Iroad rachis and distinctly i-angled; glumes 

 slightly muoronate ; ach. oblong, S-angled. — Marahea, S. Car. to I'la. (Elliott. 

 Baldwin.) 

 X3 C. strigosus L. Culmtriquetroua, leafy only at baae; Ivs. broad-linear, rough- 

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

 and oblong, iooae clusters, their sheaths 3-brisUed; involuoels or setaceous; 

 spikelets numerous, linear-aubulate, spreading horizontally, 8— 10-flowered, 1 — 9" 

 long ; invol. of about 6 leaves, the 2 outer ones very long. — "Wet grounds, U. 3., 

 frequent. Seem 1 — 2f liigh, bulbous at base. Umbel yellowish. Sept. 

 fi. SPEOiosus. Umbel compound, the partial umbels with leaf-like involucels. 

 (C. speoiosua Vahl.) 



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

 or i 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 G to 8" long, of a dusky yeDow. 



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

 shorter than the stem, about a lino 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 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. inflexTis Muhl. Culm setaceous, leafy at base, 2 — 3' high ; Ivs. equaling 

 the stem ; umbel 2 — 3-rayed, or conglomerate and siniplo ; invoL of 3 long leaves ; 

 spiJcelets oblong, 8 — 12-Jlowered, 10 — 20 together, densely cro-wded into the ovoid 

 heads; glumes yellowish, veined, squarrous-uncinato at tip; ata. 3. — Banks of 

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



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

 trous ; Iva. 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 — 25-Jiowered; fls. very regularly imbri- 

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

 — 111. (Mead.) and westward. 



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

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

 invol. of 4 or mora leaves, very long, involucela 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. vegetua Ell. Torr.) 



19 C echin&tus. Culm 10' to 2f high, 3-angled, bulbous at base; Ivs. numerous, 

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

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

 t.iwny, appressed ; stam. 3 ; ach. obovate. — ^Dry fields, S. States. Hoot 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; Ivs. radical, channeled, about i" wide; umbel 4 — Q-rayed capillary, erect, 

 spreading; sheaths truncate; hds. loose, of G — 8 spikelets; spikelets linear, com- 

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

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

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



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

 leafy only at base; Iva. mostly radical, carinate; wmhel 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., Vf. to 111. Aug. (C. mariscoides EU.) 



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

 umbel sessile or simple and few-rayed, rays spreading; spikes lanceolate, Z-edjred, 



