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Photographer: Robert R. Kowal
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Family Anacardiaceae
Toxicodendron rydbergii (Small ex Rydb.) Greene
Rydberg's poison-ivy, western poison-ivy
Toxicodendron: means "poison tree"
rydbergii: named after Per Axel Rydberg (1860-1931), a member of the New York Botanical Gardens in the late 19th and early 20th centuries, who wrote the first book on the flora of the Rockies from Canada to Mexico, and several other floras
Hazardous 
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| Status: | Native - potentially invasive |
| Plant: | erect, perennial, 1'-3' tall shrub with 1 to a few branches; stems woody; from colony-forming rhizomes |
| Flower: | white, 5-parted; inflorescence a 4"-16" elongated, branched cluster (cyme) with usually less than 25 stalked flowers; blooms June-Aug. |
| Fruit: | smooth, white to yellow berry |
| Leaf: | alternate, stalked, usually near the top of the stem, shiny, smooth, 3 parted, the widely-oval leaflets with a pointed tip |
| Habitat: | full to partial sun; woods edges, openings, prairies |
| (Glossary) |
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