DISTRIBUTION AND OCCURRENCE
SPECIES: Pinus cembroides | Mexican Pinyon 



GENERAL DISTRIBUTION : 
Mexican pinyon is distributed in the mountains of western Texas,
southwestern New Mexico, and southeastern Arizona [16,41,46,74,75,92].
A large part of its range occurs in Mexico, extending from the United
States border southward along the Sierra Madre Occidental and Sierra
Madre Oriental into northern Puebla [23,28,29,38,60].  Mexican pinyon
also occurs in Baja California Sur [18,50,85,90].

Papershell pinyon occurs on the Balcones escarpment of central and
western Texas and extends into northern Mexico [1,16,52,66,79].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES28  Western hardwoods
   FRES32  Texas savanna
   FRES34  Chaparral - mountain shrub
   FRES35  Pinyon - juniper


STATES : 
     AZ  NM  TX  MEXICO


ADMINISTRATIVE UNITS : 
     BIBE  CHIR  CORO  FOBO  SAGU


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


KUCHLER PLANT ASSOCIATIONS : 
   K019  Arizona pine forest 
   K023  Juniper - pinyon woodland
   K031  Oak - juniper woodlands


SAF COVER TYPES : 
    66  Ashe juniper - redberry (Pinchot) juniper
    67  Mohrs (shin) oak
   210  Interior Douglas-fir
   211  White fir
   237  Interior ponderosa pine
   239  Pinyon - juniper
   240  Arizona cypress
   241  Western live oak


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
Mexican pinyon occurs as individual scattered trees in interior
chaparral [11,56,61,74,82] and as occasional to frequent trees in the
Madrean evergreen and encinal woodlands [10,20,36,54,55,67,86].  Mexican
pinyon becomes dominant in the pygmy conifer (Pinus spp.)-oak (Quercus
spp.) scrub [67,84,95,97], pinyon (Pinus spp.)-juniper (Juniperus spp.)
woodlands [14,19,51,58,61,72], and pine (Pinus spp.)-oak woodlands
[11,32,50].

Mexican pinyon is an important species in Douglas-fir (Pseudotsuga
menziesii), Chihuahua pine (Pinus leiophylla var. chihuahuana), and
ponderosa pine (P. ponderosa) series [20,37].

Mexican pinyon is one of the dominant trees in pinyon series [27,49,64].
It is minor in geographical range compared to true pinyon and is
included in the true pinyon series, since Mexican pinyon replaces true
pinyon across limited areas in Arizona and New Mexico [30,63,84]

Mexican pinyon occurs as a minor species in some of the relict Arizona
cypress (Cupressus arizonica) forests that are in upland positions
[29,62,67,68,74].

Some of the publications that list Mexican pinyon as a dominant or
indicator species are:

(1)  Preliminary classification for the coniferous forest and woodland
       series of Arizona and New Mexico [49]
(2)  A series vegetation classification for Region 3 [63]
(3)  Plant communities of Texas (Series level): February 1992 [84].

Woody species associated with Mexican pinyon but not previously
mentioned in Distribution and Occurrence include Arizona madrone
(Arbutus arizonica), Texas madrone (Arbutus texana), western white
honeysuckle (Lonicera albiflora), and Madrean mockorange (Philadelphus
madrensis) [11,19,49,74].

Related categories for Species: Pinus cembroides | Mexican Pinyon