Sustainability: Rengas is not listed in the CITES Appendices, and several species in the Gluta genus are reported by the IUCN as being of least concern; an exception is Gluta papuana, a species endemic to New Guinea, which is reported as vulnerable due to a population reduction of over 20% in the past three generations, caused by a decline in its natural range, and exploitation.
Smodingium argutum E.Mey. ex Sond. The African poison ivy (Smodingium argutum) is a southern African shrub or medium-sized tree in the Anacardiaceae, which has properties comparable to the American poison ivy, as its sap contains heptadecyl catechols that are toxic to the skin.
Here is the problem with Atlantic poison oak, or Toxicodendron pubescens: it looks almost identical to poison ivy, and many people use the two terms interchangeably. Actual Atlantic poison oak is not nearly as common as eastern poison ivy. It seems to grow in dry, sandy areas. The only place I have found it, so far, is in southern New Jersey, where an expert botanist showed it to me.
Rhus toxicodendron L. var. vulgaris Michx. TOCR2: Toxicodendron crenatum Mill., nom. utique rej. TODE2: Toxicodendron desertorum Lunell: TORAR2: Toxicodendron radicans (L.) Kuntze var. rydbergii (Small ex Rydb.) Erskine: TOVO2: Toxicodendron volubile Mill., nom. utique rej.
Toxicodendron vernicifluum (formerly Rhus verniciflua), also known by the common name Chinese lacquer tree, is an Asian tree species of genus Toxicodendron (formerly Rhus) native to China and the Indian subcontinent, and cultivated in regions of China, Korea and Japan.
Poison sumac, Toxicodendron vernix, is related to the poison ivies and poison oaks, not to the other sumacs. It is relatively rare compared to the other members of the family. The rash-causing agent, urushiol, is the same, and it causes the same rashes. While poison sumac is rare, when you find it in its typical wetland habitat, you may find quite a bit.