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U.S. Department of Health and Human Services

FDA Poisonous Plant Database

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AUTHOR(S): Guin, J. D.; Gillis, W. T.; Beaman, J. H.
TITLE: Recognizing the Toxicodendrons (poison ivy, poison oak, and poison sumac).
YEAR: 1981 CITATION: J Am Acad Dermatol, 4(1), 99-114 [English]
FDA #: F07992
ABSTRACT: Poison ivy, poison oak, and poison sumac are now classified in the genus Toxicodendron which is readily distinguished from Rhus. In the United States, there are two species of poison oak, Toxicodendron diversilobum (western poison oak) and Toxicodendron toxicarium (eastern poison oak). There are also two species of poison ivy, Toxicodendron rydbergii, a nonclimbing subshrub, and Toxicodendron radicans, which may be either a shrub or a climbing vine. There are nine subspecies of T. radicans, six of which are found in the United States. One species of poison sumac, Toxicodendron vernix, occurs in the United States. Distinguishing features of these plants and characteristics that separate Toxicodendron from Rhus are outlined in the text and illustrated in color plates.
GRIN #: 101865 Exit Disclaimer
COMMON NAME: western poison-oak
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron diversilobum
STANDARD PLANT NAMEToxicodendron diversilobum (Torr. & A. Gray) Greene
GRIN #: 400608 Exit Disclaimer
COMMON NAME: eastern poison-oak
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron toxicarium
STANDARD PLANT NAMEToxicodendron pubescens Mill.
GRIN #: 101866 Exit Disclaimer
COMMON NAME: poison-ivy
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze
FDA #: F07992
GRIN #: NoSource Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp. divaricatum
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. divaricatum (Greene) Gillis
GRIN #: 409819 Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp. eximium
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. eximium (Greene) Gillis
FDA #: F07992
GRIN #: VAST Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp. negundo
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. negundo (Greene) Gillis
FDA #: F07992
GRIN #: NoSource Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp pubens
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. pubens (S. Watson) Gillis
GRIN #: 409814 Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp. radicans
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. radicans
GRIN #: 409815 Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron radicans ssp. verrucosum
STANDARD PLANT NAMEToxicodendron radicans (L.) Kuntze subsp. verrucosum (Scheele) Gillis
GRIN #: 409811 Exit Disclaimer
COMMON NAME
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron rydbergii
STANDARD PLANT NAMEToxicodendron rydbergii (Small ex Rydb.) Greene
GRIN #: 101871 Exit Disclaimer
COMMON NAME: poison sumac
STANDARD COMMON NAME
FAMILYAnacardiaceae
LATIN NAMEToxicodendron vernix
STANDARD PLANT NAMEToxicodendron vernix (L.) Kuntze
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