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Family: Anacardiaceae
  Genus: Rhus

    Rhus aromatica Aiton*+

        fragrant sumac, squaw-bush
    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.
    Rhus aromatica Aiton var. serotina (Greene) Rehder+

        fragrant sumac, squaw-bush
             Rhus aromatica Aiton subsp. serotina
             Rhus trilobata Nutt., sensu Fassett (1940)
             Rhus trilobata Nutt. var. serotina (Greene) F.A.Barkley
    Rhus copallina L.*+

        dwarf sumac, flame-leaf sumac, shining sumac
             Rhus copallina L. var. copallina
             Rhus copallina L. var. latifolia Engl.
    Rhus glabra L.*+

        smooth sumac
             Rhus borealis Greene
             Rhus calophylla Greene
             Rhus glabra L. var. laciniata Carrière
             Rhus glabra L. var. occidentalis Torr.
    Rhus hirta (L.) Sudw.*+

        staghorn sumac, velvet sumac
             Datisca hirta L.
             Rhus typhina L.
             Rhus typhina L. f. dissecta Rehder
             Rhus typhina L. var. laciniata A.W.Wood
    Rhus toxicodendron L.
        poison-ivy, poison-oak
    Rhus X pulvinata Greene (pro sp.) X +

        hybrid sumac, northern sumac, pulvinate sumac
             Rhus glabra L. var. borealis Britton
             Rhus pulvinata Greene
             Rhus X borealis (Britton) Gleason (emended) X
  Genus: Toxicodendron

    Toxicodendron radicans (L.) Kuntze
        common eastern poison-ivy
             Rhus radicans L.
    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.

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