66 MISCELLANEOUS CIRCULAR 92, U. S. DEPT. OF AGRICULTURE 



(not Aiton), Populus deltoides occidentalis Rydberg, Populus occidentalis Rydberg, 

 and as Populus sargentii Dode, the latter being the oldest name. 



NAME IN USE 



Cottonwood 



*Populus fremontii S. Watson. Cottonwood. 



Range. — Northern California (headwaters of the Sacramento River, and 

 southward in western part of the State) to Lower California (San Pedro Martir 

 Mountains) . 



NAMES IN USE 



Cottonwood (Calif.). Fremont Cottonwood (Hort.). 



Populus fremontii thornberii Sargent. 



Range. — Southern Arizona (near Tucson) ; southwestern New Mexico (vicin- 

 ity of Silver City). Attention was called to this tree first by J. J. Thornber, 

 after whom it was named. 



Note on nomenclature. — Formerly probably considered a form of Populus 

 fremontii S. Watson. 



Populus fremontii pubescens Sargent. 



Range. — Southern Utah (Washington County), southwestern Nevada (Min- 

 eral County) and in southern California (San Bernardino and San Diego Coun- 

 ties, where it occurs abundantly.). 



Note on nomenclature. — Formerly considered an eastern form of Populus 

 fremontii S. Watson. 



Populus fremontii toumeyi Sargent. 



Range. — Arizona (vicinity of Tucson; Pima Canyon in Santa Catalina Moun- 

 tains; along Santa Cruz River in Pima County; at Nogales; and on Hermit 

 Creek in Grand Canyon) . 



Note on nomenclature. — Formerly probably considered a form of Populus 

 fremontii S. Watson. 



Populus fremontii macrodisca Sargent. 



Range. — Southwestern New Mexico (vicinity of Silver City, Grant County). 

 Note on nomenclature. — Formerly probably treated as a form of Populus 

 fremontii S. Watson. 



X Populus parryi Sargent. Hybrid. 



Range. — California (on Cottonwood Creek — west side of Owen's Lake, in 

 Inyo County, and in the Canoda de las Uvas — approximately 2 miles north of 

 Fort Tjon, Kern County — Coville and Funston). Also planted in streets of 

 San Bernardino. 



Note on nomenclature. — Believed to be a hybrid between Populus fremontii 

 S. Watson and Populus trichocarpa Hooker. C. C. Parry appears to have first 

 noticed the planted trees in San Bernardino in 1883, believing them to be of an 

 exotic species; while in 1892 F. V. Coville, was the first to point out that the 

 wild tree has characteristics between Populus fremontii S. Watson and Populus 

 trichocarpa Hooker. 



Populus palmeri Sargent. Cottonwood. 



Range. — Southwestern Texas (Upper Nueces River, Uvalde County; Palo 

 Pinto County — vicinity of Strawn). Discovered by E. J. Palmer in 1918 

 (Sargent). 



NAME IN USE 



Cottonwood 





