fjeS Obder 155.— ctpbracb^. . 



170 C. retr6rsa Soh-w. i Spikes about 3, rarely 1, often with a few perig. at 



the base; s spikes 4 — 6, oblong, cyl., approx., dense-flowered, with long and 

 leafy bracts, the lowest often remote and long ped. ; perig. ovate-inflated, subglo- 

 boua, rostrate, bifurcate, nerved, reflexed, twice longer than the lane. gl. ; culm 

 15 — 30', scabrous above, large, stiff, and leafy. — Bright green. In clusters, about 

 pools of water, common. The lower spikes sometimes have 1 or 2 smaller spikes 

 attached to them. 



171 C. Sclnveinitzii Dew. i Spikes 2, rarely 1, upper long .and slender, lower 

 with a few perig. at the base ; 9 spikes 2 — 4, oblong, cyl, subapprox., subrecurved, 

 rather close-flowered, lowest often long-ped. ; perig. ovate-oblong, tapering above, 

 rostrate, inflated, nerved, glabrous, bifurcate, longer than the subulate, sulsetaeeoua 

 gl. ; culm 6—12', scabrous above, very leafy. — Pale yellowish-green. Wet sandy 

 grounds, N. T., K J., and northward. 



172 C. mir&ta Dew. & Spikes 2 or more, long-oyl., near, loose, with long, 

 linear, rough-awned gls. ; S spikes 2, long-cyl., stalked, lax-flowered, subereet, 

 bracted, yellowish, staminate at apex ; perig. lance-ovate, slender, long-conic, ros- 

 trate, scarcely inflated, scabrous, oblique at the long-cuspidate beak, diverging, 

 long-pediceled, equaling or longer than the narrow, rough-awned gl.; culm 2f, 

 erect, very rough, stiff, shorter than the stiff, rough edged Ivs. ; light-yellowish 

 green. — Greece, N. T. (Bradley). (C. aristata, Boott, &c., but very diSerent.) 



173 C. longirostris Torr. (B. t. 11.) i Spikes 3, short; $ spikes 2 — 3, cyl, 

 quite loose-flowered, pendulous, suidistant, with filiform ped. ; perig. ovate, globous, 

 inflated, glabrous, long-rostrate, hispid, a little longer than the lance or ovate, cus- 

 pidate gl. ; St. 15 — 30', rather slender, Btiff,.leafy below. — Bright green. On light 

 soil of hedges in N. England and N. York, common. 



174 C. Vaseyi Dew. S Spikes 2 to 4, slender, the highest long-cylind'ric, ths 

 next shorter ; S spikes 2, often 3, long-cyL, loose, remote, bracteate, only the 

 lowest long-ped. ; perig. ovate-oblong, inflated, long-terete-rostrate, somewhat triq., 

 serrate on the bifiircate beak, glabrous, veined, much longer than the lance-oblong 

 glume ; culm about 2r, erect, stiff, shorter than the rough Ivs. ; bright green. — Wet 

 places, N. T. to 111. (Vasey). (C. vesicaria 0. Boott., &c.) 



175 C. lactistris Willd. i Spikes 3 — 4, erect, sessile ; ? spikes 2 — 3, erect, 

 oblong, cyUndric, short-pedunculate ; perig. ovate-oblong, tapering or lanceolate, 

 bifurcate, glabrous, a little longer than the oblong, mucronate gl; culm 2 — 3fJ scab- 

 rous above, erect and large, with long and large leaves and bracts. — Light green. 

 Marshes. Common. (C. riparia Mulil. neo Gooden.) 



176 C. riparia Gooden. S Spike 3 — 5, oblong, thick, erect, sessile; S spikes 

 2 — 3, erect, oblong, often long-oylindric ; perig. ovate-elliptic, contracted into a 

 short, bifurcate beak, glabrous, about equaling or shorter than the ovate, mucro- 

 nate, or oblong-lanc. gl ; culm 2— -3^ scabrous above, leafy below. — Bright green. 

 Mich. (Oooloy) and westward. Distinguished from tlie preceding by its broader, 

 more inflated fruit, and its oblong-ovate, mucronate glume, which often surpasses 

 the perig. 



177 C. aristata R. Br. (B. t. 58.) 9 Spikes 2 — 4, cylindric, distant, close- 

 flowered, erect; perig. ovate, oblong, nerved, deeply bifid, very glabrous, long- 

 rostrate, longer than the oblong, awned, greenish glume ; Ivs. and sheaths villous 

 on the under side ; st. a foot or more high. — Bright green. "Watertown, N. Y, 

 far west and north. Is not this very closely related to No. 160 ? 



178 C. iitricuiata Boott, (t. 31) S Spikes 3 or 4, slender, cyl., long, often 

 bracteate ; 9 spikes about 3, long-oyl., large, often stam. above, subremote, the 

 lowest tapering below, loose and stalked, with bracts surpassing the culm ; perig. 

 oval-oblong, drawn into a terete, tapering, bifurcate beak, smooth, veined, straw- 

 colored, larger than the lanceolate, purple, roughrawned glume; culm 2 to 3f, 

 shorter than the broad, stiff, nodous, netted, glaucous Ivs. — Abundant in marshy 

 places wide over the country. (0. ampullacea, /3. Carey.) 



/3. SPAESIPLORA. Spikes all very long (4 to 6'), dender, the 9 spikes very 

 loose, and more so below, the lowest long-p.edunculate ; perig. smaller and 

 glume longer. — Watertown, N. Y. (Crawe). 



179 C. ampullacea Good, i Spikes 2 or 3, cyl,, erect; 9 spikes 2 or 3, long- 

 cyl., erect, quite dense, short-ped., bracteate ; perig. ovate-globous, a little inflated, 



