CATALOGUE. 275 



margined, 3-4" wide (radical, and toward lower part of the stem) ; invo- 

 lucre 3-leaved, leaves much exceeding the umbel ; 3-4 rays of the umbel 

 erect, many 8-14-flowered spikelets agglomerated into an oblong head; 

 scales ovate, obtuse, 7-9-nerved, sides brown and midrib green; the bracts 

 subtending the spikelets setaceous, nearly as long as the spikelet ; achenia 

 triangular-ovate, somewhat shorter than the scales ; stigmas 3 ; stamens 

 3.— Sanoita Valley, Arizona (600, (501). 



Cyperus rotundatus, L., var. Hydra, Gray. — Nevada. 



Cyperus phymatodes, Muhl. (C. repens, Ell.; Bot. Mex. Bound.). — 

 Southern Arizona (365, 400 a). 



Hemicarpha subsquarrosa, Nees. — A luxuriant specimen from Camp 

 Lowell, Southern Arizona (715). It appears to me as though this genus 

 rests on insufficient foundation, the inner scale being so often reduced to a 

 minimum, and at limes is wanting altogether. 



Eleocharis palustris, E. Br. — Camp Grant, Arizona, furnishes a 

 specimen (380) with the bristles shorter than the achenium ; San Luis 

 Valley, Colorado (927, 977). 



Eleocharis acicularis, R Br.— Alkaline flats of San Luis Valley, 

 Colorado (928). Bristles twice as long as the achenium. 



Scirpus pauciflorus, Lightfoot. — Twin Lakes, Colorado (926). 



Scirpus puncens, Vahl. — Denver (925), and Gila Valley, Arizona, at 

 3,080 feet elevation (336). Nevada. 



Scirpus validus, Vahl. — San Luis Valley (930) ; Western New 

 Mexico, at 6,500 feet elevation (104, Loew) ; also Arizona (330 a), with 

 bristles to fruit longer than achenium ; and Nevada. 



Scirpus maritimus, L. — Nevada. 



Eriophorum polystachyon, L. — Twin Lakes (968). 



Fimbristylis capillaris, Gray. — Southern Arizona (611, 624). Quite 

 variable in size and in shape of fruit. 



Cladium effusum, Torr. — Culms nearly terete, 3-7° high; elongated, 

 linear leaves acutely serrate on back and margin ; spikes small, several in 

 a cluster, forming lavge, loose panicles ; scales 4-7, the lowest empty, 

 the top one with a perfect flower, and the one below it with a staminate 

 flower. — Nevada. 



