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



Massachusetts to Washington, south to Alabama, Texas, Arizona, 

 and California. 



18. Juncus acuminatus Michx., Fl. Bor. Amer. 1:192. 1803. 

 Locally common in the Santa Catalina and Rincon Mountains 



(Pima County), 3,000 feet or higher, late March to October. Maine 

 to British Columbia, south to Georgia, southern Arizona, and Oregon. 



19. Juncus mertensianus Bong., Acad. St. Petersburg Mem. VI. 



Math., Phys., Nat. 2:167. 1832. 

 Known in Arizona from one collection only, in De Motte Park, 

 Kaibab Plateau, Coconino County, 9,000 feet (M. E. Jones 6056). 

 Alaska to New Mexico, northern Arizona, and California. 



20. Juncus badius Suksd., Deut. Bot. Monatschr. 19:92. 1901. 



Juncus truncatus Rydb., TorreyBot. Club Bui. 31:399. 1904. 



Common in Coconino County, Grand Canyon and vicinity, 6,500 

 to 9,000 feet, also collected once in Yavapai County, July to Septem- 

 ber. Wyoming to Washington, south to New Mexico and northern 

 Arizona. 



21. Juncus ensifoliusWikstr.,K.Vetensk.Akad.Handl. 2:274. 1823, 



Represented from Arizona by a single collection from Square Lake, 

 4,800 feet (P. A. South in 1910). Saskatchewan to Alaska, south to 

 northern Arizona and California. 



22. Juncus xiphioides E. Mey., Syn. June. 50. 1822. 



Common in the Santa Rita Mountains (Pima County) , along 

 streams, 5,000 feet or higher, occurring also in the Bradshaw Mountains 

 (Yavapai County), July to August. Arizona, California, and northern 

 Baja California. 



23. Juncus tracyi Rydb., Fl. Rocky Mount. 155. 1917. 



The only known collection of this species from Arizona is from 

 Kaibab Trail to Roaring Springs, Grand Canyon, Coconino County 

 (Eastwood and Howell 7072). Idaho to northern Arizona and Nevada. 



24. Juncus saximontanus A. Nels., Torrey Bot. Club Bui. 29: 401. 



1902. 



Juncus xiphioides var. montanus Engelm., St. Louis Acad. 



Sci. Trans. 2:481. 1902. 

 Juncus parous Rydb., Torrey Bot. Club Bui. 31 : 401. 1904. 

 Juncus brunnescens Rydb., ibid. p. 400. 



Yavapai, Greenlee, Graham, and Cochise Counties, common along 

 streams and in meadows, 4,000 to 9,500 feet, July to October. Colorado 

 to British Columbia, south to New Mexico, Arizona, and Oregon. 



Forma brunnescens (Rydb.) Hermann is by far the commonest rush 

 in Arizona and is known from Apache, Navajo, Coconino, Yavapai, 

 Greenlee, Gila, Cochise, and Pima Counties. It has numerous (usually 

 more than 10) heads which are few- (5- to 12-) flowered, averaging 

 5 to 6 mm. in diameter, whereas in typical J. saximontanus the few 

 (seldom more than 10) heads are many- (15- to 25-) flowered, averaging 

 7 to 10 mm. in diameter. 



