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Family: Anacardiaceae
  Genus: Toxicodendron

    Toxicodendron radicans (L.) Kuntze
        common eastern poison-ivy
             Rhus radicans L.
    Toxicodendron radicans (L.) Kuntze subsp. negundo*+

        common eastern poison-ivy, poison-ivy
             Toxicodendron negundo Greene
             Toxicodendron radicans (L.) Kuntze var. negundo (Greene) Reveal
    Toxicodendron rydbergii (Small ex Rydb.) Greene*+

        Rydberg's poison-ivy, western poison-ivy
             Rhus radicans L. var. rydbergii (Small ex Rydb.) Rehder
             Rhus radicans L. var. vulgaris (Michx.) DC.
             Rhus rydbergii Small ex Rydb. (pro parte)
             Rhus toxicodendron L. var. vulgaris Michx.
             Toxicodendron desertorum Lunell
             Toxicodendron fothergilloides Lunell
             Toxicodendron radicans (L.) Kuntze var. rydbergii (Small ex Rydb.) Erskine
    Toxicodendron vernix (L.) Kuntze*+

        poison sumac, swamp sumac
             Rhus vernix L.
  Genus: Rhus

    Rhus aromatica Aiton var. aromatica +
        fragrant sumac, squaw-bush
             Rhus aromatica Aiton var. illinoensis (Greene) Rehder
             Rhus canadensis Marshall var. illinoensis (Greene) Fernald
             Schmaltzia crenata (Mill.) Greene
             Schmaltzia illinoensis Greene
             Toxicodendron crenatum Mill.

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