750 Order 155.— CYPERACE^. 



suboval or oblong, tapering at base, veined, oonyex-terete, attenuate above into a 

 terete, sJwriish, straight or svhrecwrved, hidenlate beak, neariy horizontal in maturity, 

 longer than the ovate and acute glume ; culm slender, 4 to 6' high, with long slen- * 

 der leaves sheathing at base. "Wayuo Co., N. Y. (Sartwell), N. to Greenland. 

 (C. Davalliana, 2d edit.) 



3 C. ^xilis Dew. (Boott, lllust, No. 45.) $ Spike terminal, ovato or oblong, 

 close-flowered, staminate below, sometimes a single S spilio or a single S -spike I 

 perig. ovate-lanceolate, convex above and slightly below, serrulate on the margin, 

 minutely veined above, 2-tootlied, diverging, some longer than the ovate-lanceolate 

 glume ; culm 12 to 20' high, stiffly erect, and Ivs. setaceous. — Swamps, B. Mass. 

 (Oakes), Sandford Lake, N. Y. (Sartwell). 



/?. ANDRoaTSA. One or moro short S spikes below the terminal. — Manches- 

 ter, N. Y. (Kneiskem). 



4 C. sterilis Willd. (Boott, Illus., No. 135.) Spike compound, i below, often 

 dioecious ; spikeleta 4^^6, ovate, subapproximato ; perig. ovate, acuminate or sub- 

 rostrate, bifid, compressed, triquetrous, scabrous on the margin, equaling the ovate, 

 acutish glume ; st. 2 f high, erect and stiff. TVet places, common. (C. stellulata 

 IS. STERILIS Torr., Carey.) 



5 C. bromoides Schk. Spikeleta numerous, alternate, S below, sometimes ail 

 S ; periff. lanceolate, erect, acuminate, scabrous, nerved, bilid, twice longer than 



the ovate-lanceolate glume. — Common in small bogs, in wet places. 



6 C siccata Dew. (Boott, TUust., No. 50.) Spikelets numerous, s above, often 

 wholly S , ovate, close or approximate ; perig. ovate, lanceolate, acuminate, com- 

 pressed, nerved, bifid, scabrous on the margin, equaling the ovate, lanceolate glwmc 

 — Sandy plains, Westfleld, Mass. (Davis) ; Ipswich, Mass. (Oakes) ; widely spread 

 over the country, but not abundant, W. to 111. 



7 C. Sartwellii Dew. Spikelets 12 — 20, ovate, sessile, compact, Ijracteate, lower 

 ones especially fructiferous ; upper often S at apex, sometimes wholly $ ; perig. 

 ovate, lanceolate, convexo-concave, subulate, slightly 2-toothed, margined and 

 scabrous on the edge, a little longer than the ovate and acute glumo ; Iva. flat, 

 linear, shorter than the stem. — Junius, Seneca Co., N. Y. (Sartwell). 



8. C. distycha Huds. Spikelets many, 2-rowed or compressed into a flattened, 

 compound, loose spike ; spikelets oblong-ovato, close, alternate, often branched be- 

 low and the lowest sometimes remote, upper and lower often ? , and the inter- 

 mediate wholly S , or from the middle wholly $ upwards ; perig. ovate, narrow- 

 rostrate, margin serrulate, narrow, equaling the ovate, acute glume ; culm erect, 

 leafy below. — Wis. (Lapham), 111. (Tasey), Mich. (Cooley), N. to Arc. Am (C. 

 intermedia Good.) 



9. C deoomposita Muhl. (Boott, lUust., 53.) Spike decompound or paniculate; 

 spikelets very many, ovate, alternate; perig. ovate, convex on both sides, triangu- 

 lar, acutish or short rostrate, short, brownish, glabrous, larger than the ovate, acu- 

 minate, whitish glume; st. IS — 30' high. — Found in swamps, Michigan, and in 

 Yates Co., N. York (SartweU). 



10 C. prairea Dew. Spike below branched ; spikelets ovate, sessile, 5 to ■? on a 

 branch ; perig. ovate-lanceolate, convex both sides, scabrous on the margin, slightly 

 bifid, smaller than the ovate-lanceolate glume ; st. 2 — 3f high, leafy towards the 

 base. — Abundant in the prairies of Michigan, and sparingly found in N. England 

 and N. Y. Resembles C. paniculata L., which has a much broader ovate glumo 

 shorter than the perigynlmn and is far more paniculate, and for which this has 

 been taken. From No. 24 it is far separated by its panicle, and the color and 

 shape of its fruit. 



11 C. oephalophora "Willd. Spikelets ovate, densely aggregated into an ovate 

 head (1 J' long), bracteate, about 5 ; perig. ovate, acuminate, compressed, bifid, 

 scabrous on the margin, with a short, ovato, and ,scal>ro-cuspidate glume, which 

 equals it; st. 8 — 16' high. — Borders of fields and woods, common, but not 

 abundant. 



12 C. Muhlenb^rgii Schk. Spikelets alternate, obtuse, approximate into an 

 ovate-oblong head, -f ' long, with a long bract at the lower one ; perig. ovate, con- 

 vex above, very smooth, nerved, bifid, scabrous on the margin, some diverging, 

 a little shorter than the ovate and mucronate -glume ; st 12 — 18' high.— In 



