Toxicodendron rydbergii (Small ex Rydb.) Greene
Family: Anacardiaceae
Rydberg's poison-ivy, western poison-ivy
Toxicodendron rydbergii image
Derek Anderson  
Etymology: Toxicodendron: means "poison tree"
Plants: erect, perennial, 1'-3' tall shrub with 1 to a few branches; stems woody; from colony-forming rhizomes
Leaves: alternate, stalked, usually near the top of the stem, shiny, smooth, 3 parted, the widely-oval leaflets with a pointed tip
Flowers: white, 5-parted; inflorescence a 4"-16" elongated, branched cluster (cyme) with usually less than 25 stalked flowers; blooms June-Aug.
Fruits: smooth, white to yellow berry
Habitat: full to partial sun; woods edges, openings, prairies
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native - potentially invasive