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Unlike Toxicodendron radicans (eastern poison ivy), which often appears as a trailing or climbing vine, T. 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.
Greene (synonym Rhus rydbergii) – Western poison ivy is found in northern parts of the eastern United States. It also exists in the western United States and Canada but is much less common than poison oak. It may grow as a vine or a shrub. It was once considered a subspecies of poison ivy. It does sometimes hybridize with the climbing species.
Poison ivy is a type of allergenic plant in the genus Toxicodendron native to Asia and North America. Formerly considered a single species, Toxicodendron radicans , poison ivies are now generally treated as a complex of three separate species: T. radicans , T. rydbergii , and T. orientale .
Poison oak is a leafy shrub that grows in shady areas of your yard where it can reach six feet in height. The leaves and stems of the western poison oak plant ( Toxicodendron ) can release an oil ...
An expert from Franklin County's Keystone Health shares information about poison ivy, oak and sumac, and the effects of the poisonous plants. Take Care: What you need to know about poison ivy, oak ...
Poison Oak. This shrub, blooming ... Poison Sumac. This tall shrub or small tree typically found in East Texas can be identified by its three to six leaf pairs with a single leaf at the stem’s ...
Toxicodendron rydbergii: western poison-ivy Anacardiaceae (cashew family) Toxicodendron radicans: eastern poison-ivy Anacardiaceae (cashew family) Toxicodendron pubescens: Atlantic poison-oak Anacardiaceae (cashew family) Toxicodendron parviflorum: small-flowered poison sumac Anacardiaceae (cashew family) Toxicodendron diversilobum: Pacific ...
The similar species T. diversilobum (western poison oak) and T. rydbergii (western poison ivy) are found in western North America, and T. orientale in Taiwan, Japan, Korea and Sakhalin. T. radicans rarely grows at altitudes above 1,500 m (4,900 ft), although the altitude limit varies in different locations. [5]