Poison Sumac
Obviously if poison is in the name, it’s going to be poisonous. But many may not know what this one looks like. And unless you have a swamp or extremely wet soil in your backyard, it’s unlikely you’ll encounter poison sumac unless exploring a nature reserve. Both the leaves and the berries are poisonous. If humans come into contact with the sap, they’ll likely develop a rash, water blisters, itchiness, and swelling. Treatment for poison sumac is similar to poison ivy. You’ll need to use a calamine lotion or hydrocortisone cream on the area to help the swelling and itchiness (Healthline).