FLOWERING PLANTS AND FERNS OF ARIZONA 161 



The form occurring in Arizona is var. inflexus (Muhl.) Boeckl. 

 (C. inflexus Muhl.)- The plant when dry has a strong odor of the 

 bark of slippery elm {Ulmusjulva Michx.). 



18. Cyperus uniflorus Tom and Hook., Ann. Lyc.X.Y. 3: 431. 1836. 

 Beaver Creek, Yavapai County (Purpus 8294), perhaps also in the 



Santa Catalina Mountains, Pima County (Thornber in 1910). Ar- 

 kansas to New Mexico, Arizona, and northeastern Mexico. 



19. Cyperus subambiguus Kiikenthal, Pflanzenreich IV. 101: 527. 



1936. 



Pinal Mountains (Gila County), Chiricahua Mountains (Cochise 

 County), Santa Rita Mountains "(Pima County), 5.000 to 6,000 feet. 

 Southern Arizona to Guatemala. 



The Arizona form is var. paUidicolor Kiikenthal. 



20. Cyperus flavus (Yahl) Nees, Linnaea 19: 698. 1847. 



Cyperus flarxymariscus Griseb.. Fl. Brit. West Indies 467. 1864. 

 Cyperus cayennensis Britton, Dept. Agr. Jamaica Bui. 5: 

 suppl. 1, 8. 1907. 



Santa Catalina Mountains. Pima County (Ove Paulsen, Kearney 

 and Peebles 10293). Louisiana to California, southward to South 

 America. 



Paulsen's collection, not seen by the writers, is cited in Pflanzen- 

 reich under the typical form. The Kearney and Peebles collection 

 seems to be var. peduncularis (Britton) Kiikenthal. 



21. Cyperus ferax L. C. Rich.. Actes Soc. Hist. Xat. Paris 1: 106. 



1792. 



Yavapai and Gila Counties to Cochise, Pima, and Yuma Comities, 

 4,000 feet or lower, common along streams and ditches. Massachu- 

 setts to Ontario, southward and southwestward to Florida, Texas. 

 California, and Mexico; Tropics of the Eastern Hemisphere. 



The seeds of C ferax, as reported by E. Palmer, were eaten by the 

 Cocopa Indians along the lower course of the Colorado River. The 

 species is represented in Arizona by the typical form and probably by 

 var. speciosus (Yahl) Kiikenthal {C. speciosus Yahl), which has a more 

 condensed inflorescence and more crowded and more highly colored 

 spikelets. The var. squarrosus (Britton) Kukenth. [C. ferrugines- 

 cens Boeckl.), with very short inflorescence rays and rust-colored, 

 finally spreading scales, may also occur. 



A species, apparently related to C. digitatus Roxb. but with much shorter 

 spikelets, was collected in an immature condition in 1939 in Separation Canyon 

 near Mead Lake, Mohave County Clover 4236 ). Miss Clover reported it to be 

 "abundant in pool-." 



3. SCIRPUS. Bulrush 



Plants fin Arizona) perennial, with terete or triangular, mostly 

 leafy flowering stems from creeping rootstoeks; spikelets solitary or 

 in heads or compound panicles; scales spirally imbricate, all fertile or 

 the lowest empty; flowers perfect; stamens 2 or 3; achene lenticular, 

 plano-convex, or triangular, usually subtended by 1 or more bristles 

 representing the perianth. 



Plants of marshes, stagnant ponds, and ditches. The tough stems 

 of an Old World species (S. lacustris L.) are used for making mats. 



