Poison-sumac (Toxicodendron vernix). Anacardiaceae. August 3, 2020 2560 × 2048 Poison-sumac (Toxicodendron vernix). Anacardiaceae. Native. Swamps, wetland margins. Napeague, June 2020. Native. Common. Swamps, wetland margins. Napeague, Long Island, June 2020.