DISTRIBUTION AND OCCURRENCE
SPECIES: Juglans major | Arizona Walnut 



GENERAL DISTRIBUTION : 
The range of Arizona walnut extends from central Texas westward to
southwestern New Mexico and central Arizona [13,24,29].  Its
distribution continues southward into northern Mexico, where it is found
from eastern Sonora to western Coahuila [30,46].  Several authors
[41,44,56] reported that Arizona walnut was found in Colorado; however,
Harrington [23] stated that no specimens had been found to support this
range extension.


ECOSYSTEMS : 
   FRES21  Ponderosa pine
   FRES28  Western hardwoods
   FRES33  Southwestern shrubsteppe
   FRES34  Chaparral - mountain shrub
   FRES35  Pinyon - juniper


STATES : 
     AZ  NM  TX  MEXICO


ADMINISTRATIVE UNITS : 
     BIBE  CACH  CHIR  CORO  FOBO  GRCA
     MOCA  SAGU  WACA  WUPA


BLM PHYSIOGRAPHIC REGIONS : 
    7  Lower Basin and Range
   12  Colorado Plateau
   13  Rocky Mountain Piedmont


KUCHLER PLANT ASSOCIATIONS : 
   K018  Pine - Douglas-fir forest
   K019  Arizona pine forest 
   K023  Juniper - pinyon woodland
   K027  Mesquite bosque
   K031  Oak - juniper woodlands
   K033  Chaparral


SAF COVER TYPES : 
   210  Interior Douglas-fir
   211  White fir
   217  Aspen
   235  Cottonwood - willow
   237  Interior ponderosa pine
   239  Pinyon - juniper
   240  Arizona cypress
   241  Western live oak
   242  Mesquite


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
Arizona walnut occurs in pure or mixed stands or as scattered
individuals.  It is dominant or codominant in the southwestern or
interior deciduous broad-leaved habitat series with Arizona sycamore
(Platanus wrightii), Fremont cottonwood (Populus fremontii), velvet ash
(Fraxinus velutina), and western soapberry (Sapindus saponaria var.
drummondii) [27,28,31,43,53].  Arizona walnut is an indicator species in
the mixed conifer series in ponderosa pine (Pinus ponderosa), white fir
(Abies concolor), Douglas-fir (Pseudotsuga menziesii), and quaking aspen
(Populus tremuloides) habitat types [2,3,19,21].  Additionally, in
southwestern oak woodlands or chaparral, Arizona walnut is seral
throughout the Emory oak (Quercus emoryi) series and is a minor
component of Gambel oak (Quercus gambelii) community type [3,25,34].

Some of the publications that list Arizona walnut as a dominant or
indicator species include:

(1)  Classification of riparian vegetation [16]
(2)  Classification of mixed broadleaf riparian forest in Tonto National
        Forest [27]
(3)  A forest habitat type classification of southern Arizona and its
        relationship to forests of the Sierra Madre Occidental of Mexico [37]
(4)  Classification of riparian habitat in the Southwest [39]
(5)  Riparian forest and scrubland community types of Arizona and New
        Mexico [52].

Species associated with Arizona walnut that were not previously
mentioned in Distribution and Occurrence information are canyon grape
(Vitis arizonica), deergrass (Muhlenbergia rigens), and common hoarhound
(Marrubium vulgare) [33,52].

Related categories for Species: Juglans major | Arizona Walnut