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Toxicodendron diversilobum
''Toxicodendron diversilobum'', commonly named Pacific poison oak or western poison oak (syn. ''Rhus diversiloba''), is a woody vine or shrub in the Anacardiaceae (sumac) family. It is widely distributed in western North America, inhabiting conifer and mixed broadleaf forests, woodlands, grasslands, and chaparral biomes.〔C. Michael Hogan (2008); ("Western poison-oak: ''Toxicodendron diversilobum''" ), GlobalTwitcher, ed. Nicklas Strömberg〕 Like other members of the ''Toxicodendron'' genus, ''T. diversilobum'' causes itching and allergic rashes in many humans after contact by touch or smoke inhalation.
==Distribution==
''T. diversilobum'' is found in California (also the original name of Los Angeles; Yangna or Iyaanga/poison oak place),〔Ron Sullivan (December 7, 2002). "Roots of native names"〕 the Baja California Peninsula, Nevada, Oregon, Washington, and British Columbia. The related ''T. pubescens'' (eastern poison oak) is native to the Southeastern United States. ''T. diversilobum'' and ''T. rydbergii'' (western poison ivy) hybridize in the Columbia River Gorge area.〔(U.S. Forest Service: ''Toxicodendron diversilobum'' )〕
''T. diversilobum'' is common in various habitats, from mesic riparian zones to xeric chaparral.〔(Jepson )〕 It thrives in shady and dappled light through full and direct sunlight conditions, at elevations below .〔 The vining form can climb up large shrub and tree trunks into their canopies. Sometimes it kills the support plant by smothering or breaking it.〔 The plant often occurs in chaparral and woodlands, coastal sage scrub, grasslands, and oak woodlands; and Douglas-fir (''Pseudotsuga menzesii''), hemlock–Sitka spruce, ''Sequoia sempervirens ''(coast redwood), ''Pinus ponderosa'' (Ponderosa pine), and mixed evergreen forests.〔(Calflora )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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