270 P.OTANY. 



Kobresia* sciepina, Willd. — Crcspitose, 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. 



CaeexI gynocrates, Wormsk. — Mosquito, Colorado (1000); Twin 

 Lakes, Colorado, Professor Wolf 



Carex scirpoidea, Mx. — South Park, Colorado (1002) ; Mosquito, 

 Colorado ; Professor Wolf. 



Carex polytrichoides, Muhl. — Twin Lakes, Wolf (1004). 



Carex obtusata, Lilij. — South Park, Colorado (1003). 



Carex Lyoni, Boott. — Twin Lakes, Colorado (1001). 



Carex siccata, Dew. — South Park (1009) ; Mosquito, Colorado 

 (1008). 



Carex Douglasii, Boott.— Santa Fe, N. Mex. (31); Denver (1010). 

 Var. minor at Twin Lakes (1011). 



Carex Cay ana, 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, dioecious, 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 nearlv 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 Bockeler, in the Linnsea, vol. 

 39, p. 54, quotes C. Guyana as a synonym of C. divisa, Huds. But the 

 often dioecious spike of Gayana, its few-nerved, furrowed perigynium with 



* Kobresia, Willd. — "Perennial herbs, with grass-like leaves, radical or sheathicg the stems at 

 the base. Spikelets sessile in a terminal spike, simple or rarely branched at the base, with a glume-liko 

 bract under each spikelet. In each spikelet the lowest glume encloses an ovary with a long trifid stylo, 

 the next one, or rarely 2 glumes, enclose 'A stamens, and there is often a small rudimentary glumo 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." — Bcntham's Handbook of the British Flora, p. 904. 



tCAKEX. — For the following careful elaboration of this genus, I am indebted to Mr. William Boott, 

 of Boston. 



