604 MACKENZIE: NoTES ON CAREX 
distinguished at sight from all forms of Carex marcida, and is 
clearly entitled to specific rank. The most easily noticed points of 
distinction may be contrasted as follows : 
Perigynium very abruptly contracted into a very short beak, about one-fifth the length 
of the body. C. stmulata. 
Perigynium tapering into a beak, one-half the length of the body or more. 
pikes with one to several inconspicuous perigynia, the head appearing a mass of 
straw-colored scales; staminate flowers conspicuous; blades 1.5—4 mm. wide. 
: C. latebrosa. 
Spikes with about ten perigynia concealed by the scales, but conspicuous ; scales 
tinged with green or brown; staminate flowers inconspicuous ; blades 1.5 mm. 
wide. C. marcida. 
The following specimens of Carex latedbrosa (all in the Colum- 
bia College herbarium except the New Mexico specimens and the 
fine specimens collected by Palmer) have been seen : 
Mexico: Sonora, Thurber 652, 185-(type); Durango, Palmer 
96, 1896 (N. Y. Bot. Gard.) ; San Bernardino, Sonora, Thurber 
337, June, 1851; Camp Tezotal, Sonora, Schott 4, 1855. 
Nevapa: Unionville Valley, Watson 1227, October, 1867 ; 
Spring Valley, Watson 1227, September, 1868. 
New Mexico: Cienega, &. O. Wooton, July 12, 1906; Mo- 
gollon Creek, Mogollon Mountains, Socorro County, O. B. Met- 
calfe, July 14, 1903. (Both in Herb. N. Mex. Agric. College.) 
v Carex simulata sp. nov. 
“Carex Gayana Desv.” Boott, Ill. Car. 3: 126. pl. 477. 
Culms 3-5 dm. high, from long running rootstocks, roughened 
on the angles, especially above, much exceeding the leaves. 
Leaves with well-developed blades two to five to a culm, all on 
its lower third, the blades erect-ascending, 8-30 cm. long, 2-4 
mm. wide, flat, roughened on the margins and towards the apex } 
spikes 5—15, densely aggregated into a linear-oblong, oblong oF 
ovate-oblong head, 12-25 mm. long, 6-10 mm. wide, the indivi- 
dual spikes not separate, but readily distinguishable, the more 
strongly pistillate ovate-oblong in outline, 7 mm. long, 3.5 ™m. 
wide, with about ten perigynia at base and the inconspicuous 
staminate flowers above, while other spikes are almost entirely 
staminate with an occasional perigynium, whole heads being almost 
entirely staminate or little staminate, as the case may be; bracts 
absent, or the lower one or two, if present, shorter than the head, 
long-cuspidate, enlarged at base; scales brown with hyaline 
margin, strongly cuspidate, wider and noticeably longer than the 
