Lanceolate Leaf: A long, narrow leaf that is broadest below the middle and gradually tapers towards the apex.
Lateral Bud: Also called “axillary buds,” lateral buds are located along the length or “axis” of a twig or stem.
Lateral Leaflet: In pinnately compound leaves, a leaflet arranged along the length of the rachis. See also terminal leaflet.
Leaf: A functional organ of a plant where photosynthesis and transpiration take place, which consists of an expanded blade (usually green) that is attached to a stem.
Leaf Scar: A mark left behind on a twig and branches after leaves are detached. The shape of the leaf scar is sometimes a key attribute in species identification, particularly in the winter.
Leaflet: One of the individual, leaf-like blades of a compound leaf. Unlike leaves, leaflets do not subtend buds.
Lenticel: A typically raised, corky grouping of cells that allow for transpiration and the exchange of gasses between the interior of a plant and the atmosphere. Lenticels may be located on the surface of bark, twigs, roots, and fruit.