Leaf Scars Leaf scars are places on the stem where leaves used to be. When the leaf drops off it leaves a scar. The outline of that scar can be seen at the node . Within the outline of the leaf scar there will be bundle scars, the scars of the old vascular bundles that attached the leaf's vascular system to that of the plant. Leaflet Leaflets are the laminas of a compound leaf.
Simple leaves contain only one lamina while compound leaves contain many lamina.
Leaflets describe these many lamina of a compound leaf. Legumes Lemmings Lemon Lenticels Lenticels are small places where the bark is pushed up in a lose fashion so that air can get to the cells of the stem for the purpose of respiration. Light Light Quality Light Intensity Lignin Lignin is embedded in the secondary wall of plant cells that are dead when functioning. Lignin typically stains red in prepared microscope slides. Fibers , sclerids , vessels , and tracheids are cells that contain lignin.