Sumac Family.
GENUS Toxicodendron produce the skin-irritating oil urushiol, a potent allergen
oil urushiol, which can cause a severe allergic reaction
SPECIES...
Species Western Poison-oak (Toxicodendron diversilobum)
Western Poison-oak (Toxicodendron diversilobum)
Poison Oak
Species Poison-ivy (Toxicodendron radicans)
all states except Alaska, Hawaii, and California
Species Western Poison-ivy (Toxicodendron rydbergii)
northern parts of the eastern United States
Species Atlantic Poison-oak (Toxicodendron. pubescens
Species Lacquer Tree or Varnish Tree (Toxicodendron vernicifluum)
Sap produces an extremely durable lacquer
Species Poison Sumac (Toxicodendron. vernix)
Small tree, from 2-7 m tall. It is found in swampy, open areas and reproduces by seeds. The leaves have between 7-13 untoothed leaflets, in a feather-compound arrangement.[4]
In terms of its potential to cause urushiol-induced contact dermatitis, poison sumac is far more virulent than other Toxicodendron species, even more virulent than poison ivy and poison oak.
According to some botanists, poison sumac (Toxicodendron vernix) is the most toxic plant species in the United States
(Frankel, 1991)
