FLOWERING PLANTS AND FERNS OF ARIZONA 253 



The type of var. subracemosum Stokes, to which all of the Arizona 

 specimens probably belong, was collected 17 miles west of Cameron, 

 Coconino County {Kearney and Peebles 12818). Specimens collected 

 by M. E. Jones in 1903 and labeled "8 miles south of Vail" (Pima 

 County) are very like E. howellii. The locality as stated is almost 

 certainly erroneous. 



49. Eriogonum leptocladon Torr. and Gray, U. S. Rpt. Expl. Miss. 



Pacif. 2: 129. 1855. 



Eriogonum ramosissimum Eastw., Calif. Acad. Sci. Proc. ser. 



2, 6: 322. 1896. 

 Eriogonum pallidum Small, Torrey Bot. Club Bui. 25: 49. 



1898. 

 Eriogonum effusum Nutt. subsp. leptocladon Stokes, Gen. Eriog. 



81. 1936. 



Navajo, Coconino, and Mohave Counties, 3,500 to 5,500 feet, in 

 sandy soil, July to September, type of E. pallidum from in or near the 

 Hopi Indian Reservation, Navajo County {Hough 30). Utah, New 

 Mexico, and northern Arizona. 



50. Eriogonum pringlei Coult. and Fish., Bot. Gaz. 17: 351. 1892. 



Eriogonum trachygonum Torr. subsp. pringlei Stokes, Gen. 

 Eriog. 59. 1936. 



"Hills near Maricopa," Pinal County {Pringle in 1882, the type 

 collection), Sierra Estrella (Maricopa County), Ajo Mountains (Pima 

 County), and Tinajas Altas (Yuma County), on dry rocky slopes, 

 flowering as late as October. Reported to occur also in southern 

 California. 



Closely related to E. wrightii Torr., but a larger, shrubbier plant 

 with smaller flowers and involucres. 



51. Eriogonum corymbosum Benth. in DC, Prodr. 14: 17. 1856. 

 Navajo County, at Kayenta {Eastwood and Howell 6547), and 



Monument Canyon {Peebles 11947), also Fredonia, Coconino County 

 {Eastwood and Howell 6385), 5,000 to 6,000 feet. Colorado to Nevada, 

 New Mexico, and northern Arizona. 



The Arizona specimens are not quite typical, approaching E. aureum 

 and perhaps better referred to that species. 



52. Eriogonum aureum M. E. Jones, Calif. Acad. Sci. Proc. ser. 2, 



5: 718. 1895. 



Eriogonum corymbosum Benth. var. divaricatum Torr. and 

 Gray, U. S. Rpt, Expl. Miss. Pacif. 2: 129. 1855. 



Eriogonum divergens Small, Torrey Bot. Club Bui. 33: 55. 

 1906. 



Eriogonum microthecum Nutt. subsp. aureum Stokes, Gen. 

 Eriog. 76. 1936. 



Apache County to northern Mohave County, 5,000 to 8,000 feet. 

 often very abundant, August to October. Colorado to Nevada, New 

 Mexico, and northern Arizona. 



The color of the perianth varies from bright yellow to nearly white, 

 sometimes in the same colony. A more pubescent, slightly glutinous 

 form is var. glutinosum M. E. Jones, the type of which was collected 

 at Holbrook, Navajo County {Rusby in 1883). 



