Toxicodendron rydbergii (Small ex Rydb.) Greene Engl.: western poison ivy, Rydberg's poison ivy. Suom.: myrkkysumakki. Sven.: giftsumak. Bot. syn.: Rhus radicans L. var. rydbergii (Small ex Rydb.) Rehd., Rhus radicans L. var. vulgaris (Michx.) DC., Toxicodendron desertorum Lunell
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