750 Order 155.— CYPERACE^E. 



suboval or oblong, tapering at baso, reined, convex-terete, attenuate above into a 

 terete, shortish, straight or subrecurved, lidentate beak; nearly horizontal in maturity, 

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

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

 (C. DavaHiana> 2d edit.) 



3 C. exilis Dew. (Boott, Must., No. 45.) S Spike terminal, ovato or oblongjjr 

 close flowered, staminatc below, sometimes a single $ spiko or a single 2 -spike » 

 perig. ovato-laneeolate, convex above and slightly below, serrulate on the margin, 

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

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

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



/9. ANDRoGTNA. One or more short 5 spikes below the terminal. — Manches- 

 ter, N. Y. (Kneiskern). 



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

 dioecious ; spikelets 4 — 6, ovate, subapproximato ; perig. ovate, acuminate or sub- 

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

 acuiish glume ; st. 2f high, erect and stiff. "Wet places, common. (C. stellulata 

 /?. sterilis Torr., Carey.) 



5 C. bromoides Schk. Spikelets numerous, alternate, $ below, sometimes all 

 5 i periff. lanceolate, erect, acuminate, scabrous, nerved, bifid, twice longer than 



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



6 C siccata Dew. (Boott, Must, No. 50.) Spikelets numerous, & above, often 

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

 pressed, nerved, bifid, scabrous on tho margin, equaling the ovate, lanceolate glume, 

 — Sandy plains, WestGeld, Mas3. (Davis) ; Ipswich, Mass. (Oakes) ; widely spread 

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



7 C. Sartwellii Dew. Spikelets 1 2 — 20, ovate, sessile, compact, bractcate, lower 

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

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

 scabrous on tho edge, a little longer than tho ovate and acuto glume ; lvs. flat, 

 linear, shorter thau tho 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-ovate, close, alternate, often branched bo- 

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

 mediate wholly $ , or from tho middle wholly $ upwards ; perig. ovale, narrow- 

 rostrate, margin serrulate, narrow, equaling tho ovate, acuto glume; culm erect, 

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

 intermedia Good.) 



9. C. decomposita Muhl. (Boott, Must., 53.) Spike decompound or paniculate j 

 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 (Sartwell). 



10 C. prairea Dew. Spike below branched ; spikelets ovato, sessile, 5 to 1 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 tho prairies of Michigan, and sparingly found in N. England 

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

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

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

 shape of its fruit. 



11 C. cephalophora Willd. Spikelets ovate, densely aggregated into an ovate 

 head (lV long), bractcate, about 5 ; perig. ovate, acuminate, compressed, bifid, 

 scabrous on tho margin, with a short, ovate, and scabro-cuspidate glume, which 

 equals it; st. 8 — 1G' high. — Borders of fields and woods, common, but not 

 abundant. 



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

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

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

 a little shorter than tho ovato and mucronata glume; st. 12 — 18' high. — In 



