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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.
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]
Poison ivy and poison oak are the most common around the Triangle, Briggs said, while sumac is in much wetter areas, such as the coastal plains and mountain bogs. An oily chemical is what makes ...
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 .
Toxicodendron diversilobum (syn. Rhus diversiloba), commonly named Pacific poison oak [1] or western poison oak, is a woody vine or shrub in the sumac family, Anacardiaceae. It is widely distributed in western North America, inhabiting conifer and mixed broadleaf forests , woodlands, grasslands, and chaparral biomes. [ 2 ]
Poison oak refers to two plant species in the genus Toxicodendron, both of which can cause skin irritation: Toxicodendron diversilobum or Pacific poison oak, found in western North America Toxicodendron pubescens or Atlantic poison oak, found in southeastern North America
Toxicodendron pubescens (syn. Rhus pubescens), commonly known as Atlantic poison oak, [2] or eastern poison oak, is an upright shrub which can cause contact dermatitis for most people. Description [ edit ]