Pinnately compound leaves have stems (petioles) that vary in length and connect the leaf to the tree twigs. The axil is the angle from the leaf's petiole connection to the first sub-leaf.

Poison ivy has compound leaves with three leaflets per leaf. The middle leaflet has a longer stalk than the two side leaflets, and there is often a red mark in the middle where they meet on the stem.

Each leaf has 3 leaflets, hence the adage, “Leaves of three, let it be.” Another key identifying characteristic of poison ivy is that one side of a leaflet may have an irregularly toothed margin, ...

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 ...

Compound leaves have segmented leaf blades. These can be used to identify the plant. Hughes is an Ohio State University Extension Master Gardener Volunteer in Mahoning County.

Some groups with compound leaves include hickories, walnuts, ash, buckeyes and sumac. Some tree groups have examples of each – most maples have simple leaves, but box-elder has compound leaves. We ...

In this edition of ID That Tree, Purdue Extension forester Lenny Farlee goes over leaf characteristics to look for when attempting to identify broadleaved deciduous trees in Indiana. He shares the ...

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.