Poison ivy has a compound leaf made up of 3 leaflets which can be 1 to 4 inches long. The middle leaflet is the only one with a long stalk. Courtesy Johnson County Extension Just the mention of the ...

We've all heard the classic saying "leaves of three, let it be," which means don't touch the poison ivy. But just how accurate is that timeless phrase? While this specific mnemonic device exists to ...

University of Guam Research Associate Benjamin Deloso examines a bi-pinnately compound leaf of Guam's flame tree. The endangered Serianthes nelsonii tree makes a leaf that uses this same design.

Plants that produce bi-pinnately compound leaves, such as this leaf of Guam's Serianthes nelsonii tree, are able to modify various traits of the intricate leaf design in order to maximize exploitation ...