Obder 155.— CTPERACBjE. 749 



t 8. Pistillate spikes with enclosed or nearly enclosed peduncles. Porigynia 

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



r Perigynium pubescent, brownish, abruptly beaked Nos. 98, 99 



H r Perigynium smooth, yellowish, with a short, recurved beak Nos. 100, 101 



p Perigynium smooth, inflated, with a long, straight beak, (s) 



S Spikes very short.— Whole plant yellowish green Nos. 102—104 



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



S Spikes oblong-cylindric, — very large, conic-rostrate Nos. 107—109 



— zniddle size, very abruptly rostrate No. 110 



T 9. Pistillate spikes with exserted peduncles. Perigynia S-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 Perigynium acuminate with a recurved point Nos. Ill — 113 



u Perigyn. acute or obtuse.— Lvs. lanceolate, shorter than culms Nos. 114, 115 



— Lvs, lance-linear, long as culms Nos. 116, llT 



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



V Perigynia smooth and not rostrate, (w) 



W Bracts all exceeding the— oblong, dense spikes Nos. 118, 119 



— slender, loose spikes Nos. 120, 121 



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



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



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



— Spikes tawny Kos, 124, 125 



—Spikes green. — Gl. (mostly) obtuse. ..Nos. 126, 12T 

 — Glnmes mucronate Nos. 128, 129 



V Perigynia smooth (scabrous in No. 185), rostrate, (y) 



y Bracts leafy, exceeding the stem and fruit Nos. 180 — 132 



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



z Spikes linear, slender, quite loose-flowered Nos. 138, 134 



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



z Spikes oblong, 6 to co-fld.— Culm4 to6'high*, verydelieate..No, 1ST 

 —Culm 1 to 2f high Nos. 188—140 



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



-sterile spike oval-oblong .Nos. 143, 144 



\ 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 



■ — Perigynia rostrate, the orifice entire, or nearly so.... Nos. 143, 149 



— Perig. rostrate (lew), spindle-shaped, 2-toothed No. 15[) 



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



bb Perigynianot rostrate.— Spikes ovoid, thick Nos. 151 — 153 



— Spikes linear or cylindric Nos. 154, 155 



bb Perigynia T0strate,—the beak short, scarcely 2-toothed No. (161) 156 



—the beak long and 2-parted Nos. 157 — 159 



• H. JStaminate spikes usually 2 or move. PeHgynia rostrate, (cc) 

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



dd Perigynia long-beaked, hispid-pubescent, 2-cleft, green No. 160 



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



— densely woolly, greenish Nos. 162, 168 



— hispid jmbescent, brown Nos. 164, 165 



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

 ee Spikes ( 9 ) on exserted peduncles, (ff ) 



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



ff Glumes greenish or tawny, or yellowish, (gg) 



gg Perigynium tapering into very short beaks Nos. 167, 168 



gg Perigynium long-beaked, horizontal or reflexed Nos, 169, 170 



gg Pei-igynium long-beaked, ascending.— Beak conical. .Nos, 171, 1T2 

 • —Beak cylindricNos. 173, 174 



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

 hh Spikes cyUndrical, length more than thrice diam. (kk) 



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



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



— Glumes lanceolate . Nos. 179, 180 

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



nn S Spikes 2 or 3 in number.- Beak cylindric Nos. 181, 182 



— Beak conical No. 188 



nn S Spikes 1 or 2, — pedunculate. Beaks cylindric Nos. 184, 135 



—sessile, small. Beaks conical .No. 186 



I. Stigmas 2«— Acheniuin double convex. 



1 C. capitata L. Spike capitate or nearly globous, 6 at the summit; fr. (peri- 

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

 longer than the ovate and rather obtuse glume ; Iva.' slender. — Heights of the 

 "White Mts. (Robbins). 



2 C. gynocrates Wormesk. ? Spike oblong, rather loose-flowered; perigynium 



