DISTRIBUTION AND OCCURRENCE
SPECIES: Pinus attenuata | Knobcone Pine 



GENERAL DISTRIBUTION : 
Knobcone pine is the most widely distributed of the West Coast
closed-cone species.  Discontinuous populations occur from southwestern
Oregon south through the Klamath, Cascade, and Coast ranges and the
Sierra Nevada.  Stands in the South Coast Ranges are widely disjunct,
occurring in the Santa Ana and west San Bernadino mountains, at Cuesta
Pass, San Luis Obisbo County, and near Encinada, Baja California
[14,21,32,44].


ECOSYSTEMS : 
   FRES20  Douglas-fir
   FRES21  Ponderosa pine
   FRES27  Redwood
   FRES28  Western hardwoods
   FRES34  Chaparral - mountain shrub


STATES : 
     CA  OR  MEXICO


ADMINISTRATIVE UNITS : 
     LAVO  ORCA  REDW  WHIS  YOSE


BLM PHYSIOGRAPHIC REGIONS : 
    1  Northern Pacific Border
    2  Cascade Mountains
    3  Southern Pacific Border
    4  Sierra Mountains


KUCHLER PLANT ASSOCIATIONS : 
   K006  Redwood forest
   K009  Pine - cypress forest
   K010  Ponderosa shrub forest
   K011  Western ponderosa forest
   K012  Douglas-fir forest
   K026  Oregon oakwoods
   K028  Mosaic of K002 and K026
   K029  California mixed evergreen forest
   K030  California oakwoods
   K033  Chaparral
   K034  Montane chaparral


SAF COVER TYPES : 
   215  Western white pine
   229  Pacific Douglas-fir
   231  Port-Orford-cedar
   232  Redwood
   233  Oregon white oak
   234  Douglas-fir - tanoak - Pacific madrone
   244  Pacific ponderosa pine - Douglas-fir
   245  Pacific ponderosa pine
   246  California black oak
   247  Jeffrey pine
   249  Canyon live oak
   250  Blue oak - Digger pine
   255  California coast live oak


SRM (RANGELAND) COVER TYPES : 
NO-ENTRY


HABITAT TYPES AND PLANT COMMUNITIES : 
The knobcone pine community occupies a transitional position between
chaparral and woodland and higher elevation forests.  Because of its
patchy distribution, it is usually surrounded by other communities.  At
lower elevations, it is most often associated with chamise (Adenostoma
fasciculatum)-manzanita (Arctostaphylos spp.) communities and various
oak (Quercus spp.) woodlands.  At higher elevations, it is associated
with a variety of coniferous communities (see SAF Cover Types) [44].
Within the knobcone pine community, the pines are usually widely spaced.
The community is sometimes described as woodland rather than as forest
[24].  On favorable sites, knobcone pine forms dense, even-aged stands
or dwarfed thickets.  Understory herbaceous species are usually
fire-followers and endemics.  Shrubs occur individually or in small
patches between pines.  Mosaics of chaparral, woodland, knobcone pine,
and other coniferous forests sometimes occur due to topographical and
substrate differences [32,41,44].

Publications listing knobcone pine as a dominant species are as follows:

     Vegetational types of the San Bernadino Mountains [14]
     Vegetation of the San Bernadino Mountains [31]
     A vegetation classification system applied to southern California [34]
     Mixed evergreen forest [38]
     Vegetation of the Siskiyou Mountains, Oregon and California [46]
     An introduction to the plant communities of the Santa Ana and San
       Jacinto Mountains [42]
     The closed-cone pines and cypresses [44]

Related categories for Species: Pinus attenuata | Knobcone Pine