280 BOTANY. 



ing to a rough point, shorter than the perigynia; 4 specimens of the Expe- 

 dition collection received from Washington without number or ticket 



CASES sp.! — U° high, smoothish; leaves (broken) |' wide; bracts 

 evaginatej the lower male filiform, exceeding the spikelet, the female broad, 

 plane, exceeding tin- culm; male spikes 3-4, overlapping, uppermost 1' long; 

 female -pikes 1-2, oblong or cylindrical, V long, 3" wide, 1-3' below the 

 male, 1-2' apart, occasionally with an empty bract 4-8' below the spikes; 

 perigynia (very young) ovate, spreading, tapering to a cylindrical beak, 

 with short teeth, delicately nerved ; stigmas 3 ; scales 3-nerved, purple, with 

 pale margins and midnerve, the male oblanceolate obtuse, the female lan- 

 ceolate or ovate, shorter than the perigynia ; vagina of empty bract 6" long. — 

 Willow Spring, Arizona, Rothrock (231). 



Carex sp.? — 2 C high or more, stout, glaucous, smooth and Bpongy 

 below, slightly scabrous above, and with the leaves thickly nodose-reticu- 

 lated; leaves 3" wide, much longer than the culm; male spikes 4, over- 

 lapping, about 1' long, rarely with a few female flowers at top and at bot- 

 tom; female spikes 2, f{-l£' long, §' wide, about 0" below the male, 1-4' 

 apart; sometimes staminate at top, the lowest on a short peduncle; bracts 

 of the lowest male spike shorter than the culm, clasping, with connate pur- 

 ple auricles ; bracts of the female spikes much longer than the culm, with 

 vaginas \-\' long. In the vagina of the lowest spike, the lamina opposite 

 the bract is extended above to an obtuse point. Below the female spikes 

 there is sometimes an empty bract with a vagina 9" long; perigynia (very 

 young) squarrose, broadly ovate, abruptly ending in a stout, cylindrical, 

 obliquely cut, minutely toothed, strongly nerved beak, purple at the orihce ; 

 stigmas 3 ; scales 3-nerved, purple, with pale midnerve, the male oblong 

 linear, obtuse, the female lanceolate acute, as long as the perigynia. The 

 pale fruit and purple scales give the female spikes a variegated appear- 

 ance.— Colorado (4 GO). 



Carex sp.? — Culm and leaves as in the last; male spikes 3-4, contigu- 

 ous, the upper 1-2' long, naked or rarely the lower with a filiform, clasping 

 bract exceeding its spikelet; fertPe spikes 2, narrow-cylindrical, often stami- 

 nate to near the base, \\~2' long, 1-2$' below the male, and about 2' apart, 

 sometimes with a lower, 1-S' distant, empty bract, the upper sessile, the lower 



