96 PROCEEDINGS OP THE AMERICAN ACADEMY 



angles : leaves longer than the culm, glaucous green, carinate below, 

 nerved above, rough on the margins, sheaths light cinnamon-color in 

 front, thinly membranaceous: spikes numerous (about 20), three in 

 the axils of the bract, long-peduncled, two inches long, flexuose, 

 nearly cylindrical, acute, densely flowered : bracts very long, sheath- 

 ing, the sheaths deeply cut, the upper setaceous, shorter than the 

 spike : peduncles filiform, scabrous, the lowest three inches long, the 

 others shorter : staminate scales ovate-lanceolate, acute, one-nerved, 

 nerve carinate and green, margin hyaline : pistillate scales spreading, 

 oblong-ovate, concave, shortly mucronate, mucro rough, mid-nerve 

 green, margin above ciliolate : perigynium equalling the scale, nar- 

 rowly elliptical, trigonous, slightly compressed, biconvex, 3-ribbed, 

 dull straw-colored, glabrous, beak bifid: achenium elliptical, trigonous, 

 yellowish, smooth, sides slightly convex." — Named in memory of 

 Hernando Cortez, the early explorer, discoverer of Mt. Sempoaltepec. 

 — Cerro de Sempoaltepec, Oaxaca, South Mexico, at 10,000 feet, June 

 and July, Liebmann. 



106. Carex chordalis, Liebmann, 1. c. 81. 



" Culm a foot and a half high, triquetrous, rough on the angles 

 above : leaves longer than the culm (two feet long or more), narrowly 

 linear, convolute, carinate, pale green, nerved above, margins scabrous, 

 the sheaths in front thinly membranaceous, light cinnamon in color : 

 spikes many (20-30), long-peduncled and long-bracted, three or four 

 in the axil of each bract, three inches long, slender, flexuose, densely 

 flowered : bracts very long (two and a half feet), the upper becoming 

 shorter and setaceous, sheathing, the sheaths in front membranaceous, 

 reddish, cut : peduncles filiform, scabrous, flexuose, two to three inches 

 long: staminate scales oblong, acute, one-nerved, the nerve straw- 

 colored : pistillate scales twice smaller than the staminate, long-ovate, 

 short-mucronate, mid-nerve green, lateral nerve dark purple: perigy- 

 nium elliptical, oblique, slightly compressed, smooth, dull straw- 

 colored, sides convex, beak bifid : achenium obovate and trigonous, 

 sides slightly convex." — Hacienda de Castresana in Oaxaca, South 

 Mexico, at 7,500 feet, June 1, Liebmann. 



107. Carex melanosperma, Liebmann, 1. c. 82. 



" Culm three to three and a half feet high, triquetrous : leaves two 

 feet long, four lines wide, carinate, nerved above, margins scabrous, 

 the sheaths thin-membranaceous, brownish, fibrillose : spikes about 

 twenty, three or four in an axil, shortly peduncled, two inches long 

 and flexuose, densely flowered : lower bracts very long and sheathing 

 at the base, the sheaths in front cut and membranaceous, the upper bracts 



