"752 Oedee 155.— CTPERACEuE. 



• p. MICROSPEEMA Dew. Spilcelets closely aggregated, whole spike less com- 

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

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

 Wahl.) 



23 C. setaoea Dew. /^iftefete ovate, alternate, obtuse, conglomerate, bracteate; 

 perig. ovate-lanceolaM, acumina^compiesaedL, bifid, some diverging, about equal 

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

 above and striate. — Wet places, not abundant. 



24 G. teretitisoula Good. SpiJeelets ovate, acute, sessile, decompound, brown- 

 ish, lower one bracteate ; perig. ovate, acute, convex and gibbous, scabrous on 

 the edge, spreading, longer than the ovate, acute glume ; fr. brown ; st. 18 to 36' 

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



25 C. stip^ta Muhl. Spike often decompound; spilcelets oblong, aggregated, 

 numerous, bracteate ; pefrig. ovate-lanceolate, round at the base, plano-convex, 

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

 lanceolate glwrhe ; st. thick, acutely triquetrous, concave on the sides. — Wet places 

 and marshes, abundant. 



26 C. Crus-Corvi Shuttl. (Boott. lUus. No. 64.) Spike decompound, suipani- 

 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 the ovate, acute glume; culm leafy; Ivs. 

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

 Halei Dew. C. sicEeformis Boott.) 



27 C. VTilpiua L. Spike long, la/rge, 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 the ovate, acute glume ; culm large, strong and 

 rough. — Ohio (Sullivant) to Nebraska (Hayden). 



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, serralate on the edge, bifid, subros- 

 trate, a little longer than the ovate and acuminate glume ; st. triquetrous, scab- 

 rous on the edges. — Moist ■woods, Penn. and N. Y. (Sartwell). 



29 C. stellul^ta Good. Spikelets 4 — 6, ovate, remotish, sessile; perig. broad- 

 ovate, contrasted into a short beak, compressed, slightly bifid, scabrous on the edge, 

 diverging and reflexed, a little longer than the ovate, obtusish glume j st, erect, 

 stifij leafy below, 8 — 24' high. — Common in wet places over the Northern 

 States. 



30 C. Boirpoidea Schk. pikelets about 4, ovate, approximate, sessile, obtuse, 

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

 on the margin, diverging or horizontal, longer than the ovate-lanceolate, acute 

 glume ; st. 6 — 16' high, leafy towards the base.— Wet places in the country. 

 The more lanceolate fruit and glume, and more flexible stem, separate it from the 

 preceding. C. scirpoides has the stamens chiefly below the upper spikelet. (0. 

 stellulata /3. Torr. Ac.) 



31 C. Bliokleyi Dew. Spike compounded of about 5 ovate, alternate, approxi- 

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

 low, smooth, about twice longer than the ovate-acute glv/me; culm about If 

 high, slender, with lance-linear Ivs. towards the base ; stam. chiefly at the base 

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

 nee. Schk.) 



32 C. curta Good. Spikelets 4 — T, 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 hoavy spikelets. — ^Moist places over the country. 

 (0. Eichardi Mx.) 



33 C. ten^lla Ehrh. nee Schk. Spikelets 3 or 4, ovate, roundish, remote, sessile, 

 few (^2 to 6)-fniited; perig. lance-ovate or roundish, .rosfrofe, longer than the ovate, 

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



