166 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



10. Eleocharis montevidensis Kunth, Enum. PL 2: 144. 1837. 



Eleocharis arenicola Torr. ex. Engelm. and Gray, Bost. Jour. 



Nat. Hist. 5: 237. 1847. 

 Eleocharis montana of authors. Not H. B. K. 



Huachuca and Chiricahua Mountains (Cochise County), bed of 

 the Santa Cruz River near Tucson (Pima County), wet sandy places. 

 South Carolina to California and Mexico; South America. 



11. Eleocharis acicularis (L.) Roem. and Schult., Syst. Veg. 2: 154. 



1817. 



Scirpus acicularis L., Sp. PL 48. 1753. 



White Mountains, Apache County (Goodding 1107, Griffiths 5269), 

 Coconino County, at Crater Lake (MacDougal 339) and Jacobs Lake, 

 Kaibab Plateau (Kearney and Peebles 13714), in wet soil, 8,000 to 

 9,000 feet, perhaps also in Pima County at much lower elevations. 

 North America and Eurasia. 



The var. occidentalis Svenson, to which the Arizona specimens 

 belong, is not always well marked but is characterized by rigid culms, 

 brown-margined scales, achenes with depressed tubercles, and constant 

 lack of bristles. 



12. Eleocharis bella (Piper) Svenson, Rhodora 31: 201. 1929. 



Eleocharis acicularis var. bella Piper, Fl. Palouse Region 35. 

 1901. 



Coconino County, at Mormon Lake {Tourney 524) and Flagstaff 

 (Hitchcock in 1915), Rucker Valley, Cochise County (Lemmon 481). 

 Montana to Washington southward to New Mexico and Arizona. 



*13. Eleocharis cancellata S. Wats., Amer. Acad. Arts and Sci. Proc. 

 18: 170. 1883. 

 Not definitely known from Arizona but C. Wright's No. 1937, 

 labelled as from New Mexico, may have been collected in what is 

 now Arizona. New Mexico to central Mexico. 



14. Eleocharis radicans (Poir.) Kunth, Enum. PL 2: 142. 1837. 



Scirpus radicans Poir. in Lam., Encycl. 6: 751. 1804. 

 Eleocharis lindheimeri (Clarke) Svenson, Rhodora 31: 199. 1929. 



Grand Canyon, Coconino County (Tracy 363), along the San Pedro 

 River, Cochise County (Tourney in 1894). Michigan, southern 

 United States, and Arizona; West Indies and temperate parts of 

 South America. 



5. FIMBRISTYLIS 



Plants annual or perennial; spikelets terete, in heads or umbellike 

 inflorescences; scales spirally imbricate, all fertile; achenes (in the 

 Arizona species) lenticular or biconvex, the apical tubercle deciduous. 



Key to the species 



1. Plant perennial; stems wiry, 30 to 50 cm. long; spikelets in open simple or 



compound umbellike inflorescences; style pubescent 1. F. thermalis. 



1. Plants annual or, if perennial, then the stems not wiry, less than 20 cm. long (2) . 

 2. Spikelets in small dense heads subtended by long leaf like bracts; style gla- 

 brous or minutely puberulent; stems densely tufted, not more than 15 

 cm. long 1 2. F. vahlii. 



