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



4. Juncus mexicanus Willd. in Roem. and Schult., Syst. Veg. 7: 178. 

 1829. 

 Navajo, Coconino, Yavapai, Cochise, and Santa Cruz Counties, 

 frequent, especially in slightly saline soils, 3,000 to 7,100 feet, July 

 and later. Texas, Arizona, California, and Mexico. 



*5. Juncus cooperi Engelm., Acad. Sci. St. Louis Trans. 2: 590. 1868. 

 A species of alkaline flats of the Colorado and Mohave Deserts, 

 California, and of southern Nevada, reported also from southern Utah. 

 It should be looked for in western Arizona. 



6. Juncus acutus L., Sp. PI. 325. 1753. 



The Arizona representative of this European rush of saline habitats 

 is var. sphaerocarpus Engelm. The single collection known from the 

 State is from the Grand Canyon, Coconino County (Rusby, 849). 

 The variety is found in northern Arizona, southern California, and 

 Baja California. 



7. Juncus bufonius L., Sp. PL 328. 1753. 



Frequent throughout Arizona at low altitudes (chiefly 2,000 to 

 3,000 feet) on stream banks and in dried-up pools, April to July. The 

 var. halophilus Fern, and Buch., of brackish situations, has been 

 collected at Hance's Ranch, Coconino (?) County (Wooton in 1892). 

 Nearly throughout North America; cosmopolitan. 



8. Juncus sphaerocarpus Nees in Funk, Flora 1: 521. 1818. 

 Coconino and Yavapai Counties, chiefly at about 7,000 feet, on 



borders of pools and streams, July to August. Idaho and Oregon to 

 Arizona and southern California; also in the Old World. 



9. Juncus confusus Coville, Biol. Soc. Wash. Proc. 10: 127. 1896. 

 Collections from the north wall of the Grand Canyon (Eastwood and 



Howell 7027) and from the Kaibab Plateau (Kearney and Peebles 

 13732) are the only Arizona material of this species seen. Montana 

 to Washington, south to Arizona and California. 



10. Juncus dudleyi Wieg., Torrey Bot. Club Bui. 27: 524. 1900. 

 Grand Canyon (Coconino County), Oak Creek Valley (Yavapai 



County), Verde River Valley (Maricopa County), and Pinal County, 

 frequent in damp soil, 1,000 to 6,500 feet, May to August. Maine to 

 Washington, south to Missouri, Arizona, and California. 



11. Juncus interior Wieg., Torrey Bot. Club Bui. 27: 516. 1900. 



Juncus arizonicus Wieg., ibid. p. 517. 

 Juncus arizonicus var. curtiflorus Wieg., ibid. p. 518. 

 Juncus neomexicanus Wieg., Torrey Bot. Club Bui. 30: 447. 

 1903. 



Key to the varieties 



1. Perianth 3 to 4 mm. long, equaling the capsule J. interior (typical). 



1. Perianth 4 to 5 mm. long, exceeding the capsule (2). 

 2. Bracteoles lanceolate, acuminate; perianth segments erect, rigid, 

 lanceolate, acuminate, with narrow, relatively opaque, hyaline mar- 

 gins var. arizonicus. 



2. Bracteoles broadly ovate, acute to abruptly aristate; perianth segments 

 spreading, not rigid, broadly ovate, acuminate, with broad, transparent, 

 scarious margins and brown lateral bands bordering the green cen- 

 ter var. neomexicanus. 



