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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Shrub > Species: Toxicodendron diversilobum | Poison-Oak
 

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DISTRIBUTION AND OCCURRENCE

SPECIES: Toxicodendron diversilobum | Poison-Oak
GENERAL DISTRIBUTION : Poison-oak is distributed from Baja California north to British Columbia [31,45,58]. It occurs west of the Cascade Range in Washington, Oregon, and California [32] and is ubiquitous in California west of the Sierra Nevada and the Mojave Desert [38]. ECOSYSTEMS : FRES20 Douglas-fir FRES21 Ponderosa pine FRES24 Hemlock - Sitka spruce FRES27 Redwood FRES28 Western hardwoods FRES34 Chaparral - mountain shrub STATES : CA OR WA MEXICO BC ADMINISTRATIVE UNITS : CHIS KICA LAVO OLYM PINN PORE REDW SAMO SEQU WHIS YOSE BLM PHYSIOGRAPHIC REGIONS : 1 Northern Pacific Border 2 Cascade Mountains 3 Southern Pacific Border 4 Sierra Mountains KUCHLER PLANT ASSOCIATIONS : K001 Spruce - cedar - hemlock forest K002 Cedar - hemlock - Douglas-fir forest K005 Mixed conifer forest K006 Redwood forest K009 Pine - cypress forest K010 Ponderosa shrub forest K026 Oregon oakwoods K028 Mosaic of K002 and K026 K029 California mixed evergreen forest K030 California oakwoods K033 Chaparral K034 Montane chaparral K035 Coastal sagebrush SAF COVER TYPES : 213 Grand fir 222 Black cottonwood - willow 224 Western hemlock 229 Pacific Douglas-fir 230 Douglas-fir - western hemlock 231 Port Orford-cedar 232 Redwood 233 Oregon white oak 234 Douglas-fir - tanoak - Pacific madrone 235 Cottonwood - willow 243 Sierra Nevada mixed conifer 244 Pacific ponderosa pine - Douglas-fir 245 Pacific ponderosa pine 246 California black oak 247 Jeffrey pine 248 Knobcone 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 : Poison-oak occurs in mixed evergreen forests [29,30,32,59], woodlands, chaparral, [25,26,27], coastal sage scrub [39], and riparian zones [25,26,27,39,58]. It is the most widespread shrub in California [7]. Holland [33] described a poison-oak chaparral community type that may be maintained by frequent fire. Because it is dominated by poison-oak, little is known of its community composition. Many of the plant species commonly associated with poison-oak were previously listed under DISTRIBUTION AND OCCURRENCE information. Other common associates follow, listed by community type. Associates in mixed evergreen forests include Pacific madrone (Arbutus menziesii), sugar pine (Pinus lambertiana), bigleaf maple (Acer macrophyllum), tanoak (Lithocarpus densiflorus), California bay (Umbellularia californica), and chinquapin (Chrysolepsis chrysophylla) [11,17,18,43]. Woodland associates include valley oak (Quercus lobata), interior live oak (Q. wislizenii), Monterey pine (Pinus radiata) [42], Coulter pine (P. coulteri) [9], bigcone Douglas-fir (Pseudotsuga macrocarpa) [8,64], and California walnut (Juglans californica) [48]. Chaparral associates include toyon (Heteromeles arbutifolia), chamise (Adenostoma fasciculatum), and California scrub oak (Quercus dumosa). Coastal sage scrub associates include California sagebrush (Artemesia california), coyotebrush (Baccharis pilularis), and sugar sumac (Rhus ovata) [6,26,27,47,65]. Poison-oak associates in riparian zones include bigleaf maple, California sycamore (Plantus racemosa), white alder (Alnus rhombifolia), [17], boxelder (Acer negundo), willow (Salix spp.), California blackberry (Rubus vitifolius), toyon, and wild grape (Vitis spp.) [69]. Published classifications naming poison-oak as a dominant part of the vegetation are: Description and classification of the forests of the upper Illinois River drainage of southwestern Oregon [1] Preliminary plant associations of the Siskiyou Mountain Province [2] Coast redwood ecological types of southern Monterey County, California [10] Plant communities of Santa Rosa Island, Channel Islands National Park [14] Plant association and management guide: Siuslaw National Forest [29] Plant association and management guide: Willamette National Forest [30] The community composition of California coastal sage scrub [39] Plant associations within the Interior Valleys of the Umpqua River Basin, Oregon [55] The vascular plant communities of California [59] An introduction to the plant communities of the Santa Ana and San Jacinto Mountains [65].

Related categories for Species: Toxicodendron diversilobum | Poison-Oak

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Information Courtesy: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Fire Effects Information System

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