Taxon: Toxicodendron rydbergii (Small ex Rydb.) Greene

Genus: Toxicodendron
Family: Anacardiaceae
Subfamily: Anacardioideae
Nomen number: 409811
Place of publication: Leafl. Bot. Observ. Crit. 1:117. 1905
Link to protologue:
Name Verified on: 22-Jan-1998 by ARS Systematic Botanists. Last Changed: 08-Jan-2003
Species priority site is:
Accessions: 0 in National Plant Germplasm System

Common names:

  • Rydberg's poison-ivy  (Source: Rhodora) - English

Economic Importance:

  • Vertebrate poisons: mammals (fide Lampe & McCann & Moldenke, as Rhus rydbergii; Kingsbury, as R. radicans var. rydbergii)

Distributional Range:


  • Northern America

    • Eastern Canada: Canada New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec
    • North-Central U.S.A.: United States Illinois, Iowa, Kansas, Minnesota, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin
    • Northeastern U.S.A.: United States Indiana, Maine, Massachusetts, Michigan, New Hampshire, New York, Ohio, Pennsylvania, Vermont, West Virginia
    • Northwestern U.S.A.: United States Colorado, Idaho, Montana, Oregon, Washington, Wyoming
    • South-Central U.S.A.: United States New Mexico, Texas
    • Southeastern U.S.A.: United States Virginia
    • Southwestern U.S.A.: United States Arizona, Utah
    • Western Canada: Canada Alberta, British Columbia, Manitoba, Saskatchewan


  • Allred, Kelly W. Flora Neomexicana I: The vascular plants of New Mexico, an annotated checklist to the names of vascular plants with synonymy and bibliography. (L New Mex)
  • Gillis, W. T. 1971. The systematics and ecology of poison-ivy and the poison-oaks (Toxicodendron, Anacardiaceae) (Rhodora) 73:38.
  • Lampe, K. F. & M. A. McCann AMA handbook of poisonous and injurious plants. 1985 (Lampe & McCann)


Check other web resources for Toxicodendron rydbergii (Small ex Rydb.) Greene :