276 BOTANY. 
Kopresta* scrrpixa, Willd.—Cespitose, 5-8’ high; leaves shorter than 
the stem, the few small brown spikelets clustered into a short terminal spike ; 
lower flowers are female, and the upper ones male.—Colorado. | 
Carext GyyocratEes, Wormsk.—Mosquito, Colorado (1000); Twin 
Lakes, Colorado, Professor Wolf ore 
Carex scirporpEA, Mx.—South Park, Colorado (1002); Mosquito, 
Colorado; Professor Wolf. 
Carex Po.yrricnoipes, Muhl.—Twin Lakes, Wolf (1004). 
Carex ostusata, Lilij—South Park, Colorado (1003). 
Carex Lyonr, Boott—Twin Lakes, Colorado (1001). 
Carex siccata, Dew.—South Park (1009); Mosquito, Colorado 
(1008). 
Carex Doverasu, Boott.—Santa Fé, N. Mex. (31); Denver (1010). 
Var. MINoR at Twin Lakes (1011). 
Carex Gayana, Desv.—1-2° high, slightly scabrous above; leaves 
1-2” wide, shorter than the culm; spikes ovate or oblong, of numerous 
crowded spikelets, the lower sometimes compound, dicecious, or male with 
a few female flowers, or female with a few male flowers, naked or with 
one or two clasping setaceous bracts shorter than the spike; perigynia 
dark chestnut-colored, shining, plano-convex, tapering to a very short coni- 
cal beak, whitish at the nearly entire orifice, serrate above on the obtuse 
margins, marked in front toward the somewhat cordate base with a 
longitudinal furrow and a few nerves, nerveless on the back, the walls thick 
and spongy; stigmas 2; scale chestnut-colored, more or less hyaline on the 
margins, ovate-acuminate, cuspidate, longer than the perigynia ; achene 
orbicular, dark chestnut.—Willow Spring, Arizona (232); South Park, 
Colorado (225, 383, 384, very young). Otto Béckeler, in the Linnzea, vol. 
39, p. 54, quotes C. Gayana as a synonym of C. divisa, Huds. But the 
often dicecious spike of Gayana, its few-nerved, furrowed perigynium with 
* Kosresia, Willd.—* Perennial herbs, with grass-like leaves, radical or sheathin g the stems at 
the base. Spikelets sessile in a terminal spike, simple or rarely branched at the base, with a glume-like 
bract under each spikelet. In each spikelet the lowest glume encloses an ovary with a long trifid style, 
the next one, or rarely 2 glumes, enclose 3 stamens, and there is often a small rudimentary glume or awn 
terminating the axis. Some spikelets have only one glume, enclosing an ovary, and some, near the end 
of the spike, have only one glume with 3 stamens.”—Bentham’s Handbook of the British Flora, p. 904, 
tCaREX.—For the following careful elaboration of this genus, I am indebted to Mr. William Boott, 
of Boston. 
