I 



WOOTON AND STANDLEY FLOE A OF NEW MEXICO. Ill 



Inflorescence a compound umbel with unequal rays. 

 Glumes as broad as long, 2 mm. long or less, mu- 



cronulate, usually green 4. C rusbyi. 



Glumes twice as long as broad, 3 mm. long, 

 acuminate into a spreading awn, yellowish 



brown 5. C. schweinitzii. 



Spikelets linear; scales of the flowers overlapping from 

 one-half to two-thirds their length. 

 Spikelets deciduous as a whole when mature. 



Spikelets with few, usually 2 or 3, flowers 6. C. uniflorus. 



Spikelets with 6 to 9 flowers 7. C. spedosus. 



Scales of the spikelets falling from the rachilla. 



Rachilla narrowly winged, the wings adnate; 

 plants stout, stoloniferous; spikelets loose- 

 ly clustered 8. C. esculentus. 



Wings of the rachilla not adnate, forming scales 



anterior to the flower; plants and spikelets 



various. 



Spikelets densely crowded ; flowers numerous, 



about 20 to the spikelet; scales of the 



flower not bordered with red; plants 



stout 9. C. erythrorhizos. 



Spikelets fewer, loosely clustered; flowers 12 

 to the spikelet or less; scales red- 

 margined ; plants slender 10. C. sphacelatus. 



1. Cyperus inflexus Muhl. Descr. Gram. 16. 1817. 

 Type locality: Pennsylvania. 



Range: British America south to Mexico. 



New Mexico: Cedar Hill; Shiprock; West Fork of the Gila; Santa Rita; San Luis 

 Mountains; Organ Mountains. Moist ground, in the Upper Sonoran Zone. 



2. Cyperus cyrtolepis Torr. & Hook. Ann. Lye. N. Y. 3: 436. 1836. 

 Type locality: "Texas." 



Range : Oklahoma to Texas and Arizona. 



New Mexico: A single specimen, without locality, seen. 



3. Cyperus fendlerianus Boeckel. Linnaea 35: 520. 1868. 



Type locality: Near Santa Fe, New Mexico. Type collected by Fendler (no. 865). 



Range: Arizona and western Texas to Mexico. 



New Mexico: Tunitcha Mountains; Santa Fe and Las Vegas mountains; Wagon 

 Mound; Magdaleua; Mangas Springs; Black Range; San Luis Mountains; Organ 

 Mountains; White and Sacramento mountains. Open slopes, in the Upper Sonoran 

 and Transition zones. 



4. Cyperus rusbyi Britton, Bull. Torrey Club 11: 29. 1884. 



Type locality: Near Silver City, New Mexico. Type collected by Rusby in 1880. 



Range: Mountains of New Mexico and western Texas. 



New Mexico: West Fork of the Gila; Silver City; Animas Valley; San Luis Moun- 

 tains; Organ Mountains; Arroyo Ranch; Gray; Elida; Queen. Upper Sonoran and 

 Transition zones. 



5. Cyperus schweinitzii Torr. Ann. Lye. N. Y. 3: 276. 1836. 



Type locality: Dry sand on the shore of Lake Ontario, near Greece, Monroe 

 County, New York. 



