Carex. CLX. CYPERACEA. 577 
A. Spike single. 2. Dicecious. 
2. C. DavaLuiina. Smith. 
Spike oblong, rather loose-flowered; perig. ovate-lanceolate, attenuate, 
convex, terete, recurved, longer than the ovate glume; st. and vs. are usually 
serrulate.—W ayne Co., N. Y., Sartwell. 
3. C. exitis. Dewey. ; 
Fertile spike 3 below, ovate, rather densely-flowered ; perig. ovate-lanceo- 
late, convex on both sides, diverging, serrulate on the margin, a little longer 
than the ovate, acute glume; lvs. setaceous; st. 12—20/ high. Grows in Dan- 
vers and Ipswitch, Ms., Oakes, in N. Y. and N. J. May. 
8. sguamacea. Dew. Spike often an inch long, having many ¢ glumes at the 
base and few perig. at the summit.—Longer than the other, and grows with 
it in Ipswich, Mass., Oakes. 
B. Spikes several, androgynous. 
1. Stamens variously situated—above, below, or in the middle; sometimes diecious. 
4. C. stTeritis. Willd. 
Spike compound, ¢' below, often dicwecious; spikelets 4—6, ovate, subap- 
proximate ; perig. ovate, acuminate or subrostrate, bifid, compressed, triquetrous, 
scabrous on the margin, equaling the ovate, acutish glume; st. 2f high, erect 
- and stiff—Wet places, common. 
5. C. BromOipEs. Schk. 
Spikelets numerous, alternate, gj below, sometimes all Q ; perig. lanceo- 
late, erect, acuminate, scabrous, nerved, bifid, twice longer than the ovate- 
lanceolate glume.—Common in small bogs, in wet places. 
6. C. siccata. Dewey. 
Spikelets numerous, gf above, often wholly ¢', ovate, close or approximate; 
Jr. ovate, lanceolate, acuminate, compressed, nerved, bifid, scabrous on the 
margin, equaling the ovate and Janceolate glume.—Sandy plains, Westfield, 
Mass., Davis ; Ipswitch, Mass., Oakes; widely spread over the country, but not 
abundant. 
7. C. SaRTWELLU. Dewey. 
Spikelets 12—20, ovate, sessile, compact, bracteate, lower ones especially 
fructiferous; upper often @'; perig. ovate, lanceolate, convexo-concave, subu- 
late, short, 2-toothed, a little longer than the ovate and acute glume; Js. flat, 
linear, shorter than the stem.—Junius, Seneca Co., N. Y., Sartwell. 
2. Stamens at the summit of the spikelets. 
a. Cephalous, or fruit in heads. 
8. C. cEPHALOPHORA. Willd. 
Spikelets ovate, densely aggregated into an ovate head, bracteate, about 5; 
perig. ovate, acuminate, compressed, bifid, scabrous on the margin, with a short, 
ovate, and scabro-cuspidate glume which equals it; st. 8—16’ high.—Borders 
of fields and woods, common, but not abundant. 
9. C. vunPinoiwea. Michx. (C. vulpineformis. Tuckerman. C. multi-~ 
flora. Muhl.)—Spikelets ovate-oblong, obtuse; spike decompound, bracte- 
ate, conglomerate; perig. ovate, acuminate, densely imbricate, bifid, tripli- 
nerved, diverging, a little shorter than the ovate-cuspidate glume; st. obtusely 
triangular, round and leafy towards the base—Commeon in fields. 
8. microsperma. Dew. (C. microsperma. Wahl.) Spikelets closely aggregated, 
whole spike less compact; perig. more convex, shorter, less acuminated into a 
beak, very abundant.—Grows with the other, in dry and moist situations. 
10. C. seTacea. Dewey. 
Spikelets ovate, alternate, obtuse, conglomerate, bracteate; 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. 
11. C. MuxLensercu. Schk. 4 
Spikelets alternate, obtuse, approximate, with a long bract at the lower 
