OBDEE 155. CTPERACE^J. ?49 



7 8. Pistillate spikes with enclosed or nearly enclosed peduncles. Pcrigyuia 

 mostly inflated, beaked, angular-striate. Spikes often quite large, (r) 



r Perikyuium pubescent, brownish, abruptly beaked Xos. 98, 99 



r Perigyniuin binoutu, yellowish, with a short, recurved beak Nos. 100, 101 



r Perigyniiim smooth, inflated, with a long, straight beak, (s) 



S "Spikes very short. Whole plant yellowish green Nos. 102104 



Whole plant dark green or bright green Nos. 105, 106 



S Spikes oblong-cylindric, very large, Pertg. conic-rostrate Xos. 107 10'J 



middle size, very abruptly rostrate No. 110 



T 9. Pistillate spikes with exserted peduncles. Perigynia 3-angled, scarce inflated, 



not much beaked, and (as well as the glumes) more or less colored, (t) 

 t Leaves lanceolate or lance-linear, 4 to 10' wide, (u) 



U Periayninm acuminate with a recurved point Nos. 11111:! 



U Perigyn. acute or obtuse. Lvs. lanceolate, shorter than culrns. . . .Xos. 114, 1 1S 



Lvs. lance-linear, long as culms Nos. 116, 117 



Leaves linear or setaceous (1 to 2" wide or less), (v) 

 V Perigynia smooth and not rostrate, (w) 



W Bracts all exceeding the obkuii.', dense spikes Xos. IIS, 119 



slender, loose spikes Nos. 120, 121 



W Bracts shorter than the spikes or culm, (x) 



X. Leaves setaceous and all radical. Glumes white No. 122 



X Leaves linear. Spikes blackish. White Mts No. 123 



Spikes tawny Nos. 124, 125 



Spikes green. Gl. (mostly) obtuse... Nos. 126, 127 



Glumes mucronate Nos. 128, 129 



T Perigynia smooth (scabrous in No. 135), rostrate, (y) 



y Bracts leafy, exceeding the stem and fruit Nos. 130 1S2 



y Bracts not exceeding the stem or fruit, (z) 



Z Spikes linear, slender, quite loose- flowered , ...^Xos. 133, 134 



z Spikes cylindrical, rather close, 3 in number Nos. 135, 136 



Z Spikes oblong, 6 to 00-fld. Culrn4 to 6' high, very delicate.. No. 137 



Culm 1 to 2f high Nos. 138140 



V Perigynia hairy, sterile spike linear, slender Nos. 141, 142 



sterile spike oval-oblong vNos. 143, 144 



T 10. Pistillate spikes with peduncles (long or short), scarcely sheathed at all. (aa) 



aa Spikes all erect. Perigynia not rostrate or but slightly so Nos. 145 147 



Peri?ynia rostrate, the orifice entire" or nearlyeo. . . .Nos. 14S, 14?) 



I'erig. rostnxte (lew), spindle-shaped, 2-toothed No. 150 



aa Spikes (the pistillate) soon mostly nodding, (bb) 



bb Perigynia not rostrate. Spikes ovoid, thick Nos. 151153 



Spikes linear or cylimlric Nos. 154, 15T> 



bb Perigynia rostrate, the beak short, scarcelv 2-toothed No. (161) 150 



the. beak long and 2-partcd Nos. 157 15'J 



' H. StaminaU xpikex usually 2 or more. Per-igi/nia rostrate, (cc) 

 CO Perigynia clothed with wool, hairs or mealiness, (dd) 



dd IVrizynia long-beaked, hispid-pubescent. 2-cleft, green No. ICO 



dd Perigynia short-beaked, mealy glaucous, chocolate-colored No. 161 



densely woolly, greenish Nos. 162, 1&! 



hispid pubescent, brown Nos. 1C4, 165 



CO Perigynia glabrous (or merely scabrous in No. 172). (ee) 

 ee Spikes (?) on exserted peduncles, (ff ) 



ff Glumes dark brownish purple. Bracts shorter than culm No. 166 



ft' Glumes greenish or tawny, or yellowish, (gg) 



gg Perijeynitim tapering into very short beaks Nos. 167, 16$ 



gg Perigyniiim long-beaked, horizontal or reflexed Nos. 169, 176 



gg Perigynium long-beaked, ascending. Beak conieal. .Nos. 171, 17-2 

 Beak cylindric.Nos. 173, 174 



ee Spikes (?) on sheathed, or very short peduncles, or sessile, (hh) 

 hb. Spikes cylindrical, length more than thrice diam. (kk) 



kk PeVisynium short-beaked or beakless. Hank aquatics.Nos. 175, 176 



kk Perigynium decidedly beaked. Glumes awned Nos. 177, 178 



Glumes lanceolate. Nos. 179, 180 

 hh Spikes oblong or oval, turgid, length not thrice the diam. (nn) 



nn ? Spikes 2 or 3 in number. Beak cylindric Xos. 181 182 



Beak conical No. 183 



nn Spikes 1 or 2, pedunculate. Beaks cylindric Nos. 184, 185 



sessile, small. Beaks conical No. 186 



I. Stigmas 2> Achenium double convex. 



1 C. capitata L. Spike capitate or nearly globous, $ at the summit; fr. (peri- 

 gynium) roundish-ovate, close compressed, convex-concave, glabrous, acutish, 

 longer than the ovate and rather obtuse glume ; Ivs. slender. Heights of the 

 White Mts. (Robbins). 



2 C. gynocrates Wormesk. $ Spike oblong, rather looee-flowered ; 



