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Toxicodendron rydbergii
''Toxicodendron rydbergii'' (Western poison ivy) is a species of ''Toxicodendron'' in the cashew family. It is native to most of Canada from the Maritimes to British Columbia, and most of the contiguous United States except the southeastern states, New Jersey, Delaware, and California.〔(Biota of North America Propram 2014 county distribution map )〕 It can be found growing in forests, and other wooded areas, usually near streams and rivers.〔USDA Fire Effects Information System: (''Toxicodendron radicans, T. rydbergii'' )〕
Unlike ''Toxicodendron radicans'' (Eastern poison ivy), which often appears as a trailing or climbing vine, ''Toxicodendron rydbergii'' is a shrub that can grow to 1 m (3 ft) tall, rarely up to 3 m (10 ft). The leaves are trifoliate and alternate. The leaflets are variable in size and shape, and are usually 15 cm (6 in) long, turning yellow or orange in autumn. On the compound trifoliate leaves, the two leaflets opposite each other are typically asymmetrical, in contrast to the terminal leaflet which always shows bilateral symmetry. The fruits are small, round, and yellowish.〔〔(Rydberg, Per Axel 1900. Memoirs of The New York Botanical Garden 1: 268–269 ) as ''Rhus rydbergii'' 〕
==Caution==
All parts of this plant contain Urushiol, which can cause severe dermatitis in some individuals.
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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