162 Oedkh 155.— CYPERACEJ3. 



(3. microsperma Dow. Spikelets closely aggregated, whole spike les3 a 

 pact ; perig. more convex, shorter, less acuminated into a beak, very abu 

 dant. — Grows with the other, in dry and moist situations. (0. microspen 

 Wahl.) 



23 C. setacea Dew. Spikelets ovate, alternate, obtuse, conglomerate, braeteato ; 

 perig. ovate-lanceolate, acuminate, compressed, bifid, some diverging, about equal 

 to the ovate-lanceolate, awned glume ; st. 2f high, acutely triangular, scabrous 

 above and striate. — Wet places, not abundant 



24 C. teretiuscula Good. Spikelets ovate, acute, sessile, decompound, brown- 

 ish, lower ono braeteato ; perig. ovate, acute, convex and gibbous, scabrous ou 

 the edge, spreading, longer than the ovate, acuto glume ; fr. brown ; st. 13 to 36' 

 high, leafy towards tho root. — Wet places, common, in tufts. 



25 C. stipata Muhl. Spike often decompound; spikelets oblong, aggregated, 

 numerous, bracteate ; perig. ovate-lanceolate, round at tho base, plano-convex, 

 nerved, bifid, subscabrous on tho margin, diverging, twice longer than the ovate- 

 lanceolate glume ; st. thick, acutely triquetrous, concave on tho sides. — Wet places 

 and marshes, abundant. 



26 C. Crus-Corvi Shuttl. (Boott. Illus. No. 64.) Spike decompound, iubpani- 

 culate, commonly large, and branching below ; spikelets ovate, numerous, aggre- 

 gated, sessile; perig. short-ovate, very long-rostrate, veined, convex-concave, 

 often horizontal, thrice longer than tho ovate, acuto glumo; culm leafy; lvs. 

 rough-edged ; plant light green. — River swanros, Wis. to Ohio and Fla. (C. 

 Halei Dew. C. sicceformis Boott.) 



27 C. vulpina L. Spike long, large, decompound, forming densely aggregated 

 heads, often with single but close and oval spikelets, and often less compacted ; 

 perig. ovate, broad, tapering into a 2-toothed beak, often diverging in ripening, a 

 little longer and narrower than tho ovate, acuto glumo ; culm large, strong and 

 rough. — Ohio (Sullivaut) to Nebraska (llayden). 



28 C. alopecoidea Tuckerman. (B. t. p. 67.) Spike compound, rather loose, 

 spikelets 8 to 10, aggregated into an oblong head, bracteate, sessile ; perig. ovate, 

 plano-convex, scarcely nerved, acuminate, serrulate on tho edge, bifid, subros- 

 trate, a littlo longer than tho ovate and acuminate glume ; st. triquetrous, scab- 

 rous on tho edges. — iloist woods, Penn. and N. Y. (Sartwell). 



29 C. stellulata Good. Spikelets 4 — 6, ovate, romotish, sessile ; perig. broad- 

 ovate, contracted into a short beak, confessed, slightly bifid, scabrous on the edge, 

 diverging and reflexed, a little longer than tho ovate, obtusish glume ; st. erect, 

 stiff, leafy below, 8 — 24' high. — Common in wet place3 over tho Northern 

 States. 



30 C. scirpoides Schk. Spikelets about 4, ovate, approximate, sessile, obtuse, 

 lowest bracteate ; perig. ovate, cordate, compressed, lanceolate or rostrate, scabrous 

 on tho margin, diverging or horizontal, longer than tho ovate-lanceolate, acuto 

 glumo; st. 6 — 1G' high, leafy towards tho base. — Wet places in tho country. 

 The more lanceolato fruit and glume, and more flexible stem, separate it from tho 

 preceding. C. scirpoides has the stamens chiefly below tho upper spikelet. (C. 

 stellulata /?. Torr. &c.) 



31 C. Buckleyi Dew. Spiko compounded of about 5 ovate, alternate, approxi- 

 mate spikelets ; perig. ovate-lanceolate, 2-lobed at the orifice, concave or flattish be- 

 low, smooth, about huicz longer than the ovate-acuto glume; culm about If 

 high, slender, with lance-linear lvs. towards tho baso ; stam. chiefly at the bas» 

 of tho upper spikelets. — Mts. of Car. and Ga. (Buckley.) (C. Gibhardi, BuckL 

 nee. Schk.) 



32 C. curta Good. Spikelets 4 — 1, ovate-oblong, upper subapproximate, lower 

 often remote ; perig. round-ovate, obtusish, diverging, convexo-concave, 2-toothed, 

 slightly scabrous, longer than the ovate, white, hyaline glume ; st. 1 — 2f high, usu- 

 ally light green, with silvery or hoary spikelets. — Moist places over the country. 

 (C. Richardi Mx.) 



33 C. tenella Ehrh. nee Schk. Spikelets 3 or 4, ovate, roundish, remote, sessile, 

 few (2 to 6)-fruited ; perig. lance-ovate or roundish, rostrate, longer than the ovate, 

 hyaline, white glume ; culm 1 to 2f high, slender, flaccid, and with the lvs. greeii, 



