2. Spanish Fly. "Spanish fly" is a poison not related to flies at all — and it won't increase one's sex drive, as a longstanding urban legend goes. Rather, it comes from the Lytta vesicatoria blister beetle, and even the slightest contact with its secretions (a substance called cantharidin) will make your skin erupt into painful blisters. The most dangerous and potentially life-threatening lily ingestions by cats involve lilies belonging to the genera Lilium (true lilies) and Hemerocallis. Examples of some of these toxic lilies include Asiatic, Easter, Japanese Show, rubrum, stargazer, red, tiger, Western, and wood lilies ( Lilium species) and daylilies ( Hemerocallis species). Sept. 30, 2015 1:41 am ET. Print. Text. The powerful neurotoxin in the pufferfish called fugu—a sometimes-lethal Japanese delicacy —could be a fine painkiller if it wasn't a killer, period. Japanese wisteria have spectacular flowers that fall in cascades from the vines. All parts of the Japanese wisteria are poisonous. However, the bean-like seeds are especially poisonous. Ingesting even two of them can cause serious poisoning in a child. Advertisement Japanese Pieris (Pieris japonica). Eastern poison ivy ( Toxicodendron radicans) is a woody, perennial vine or small shrub that can be found in fields, pastures, woodlands, farms and home landscapes. As a vine, it attaches itself to trees or other structures with hairy, aerial roots borne along the stem. Poison ivy has compound leaves that occur in threes (trifoliate or three.