Keeled. With a central ridge like the keel of a boat.
Laciniate. Cut into narrow, pointed lobes.
Lanceolate. Lance-shaped, broadest above the base and tapering to the apex, but several times longer than wide. Page [xii.]
Lateral. Situated on the side of a branch.
Leaf. The green expansions borne by the branches of a tree, consisting of a blade with or without a petiole.
Leaflet. One of the small blades of a compound leaf.
Leaf-scar. The scar left on a twig by the falling of a leaf. Page [xvi.]
Legume. A pod-like fruit composed of a solitary carpel and usually splitting open by both sutures (Leguminosae).
Lenticels. Corky growths on young bark which admit air to the interior of a twig or branch.
Linear. Long and narrow, with parallel edges (as pine needles). Page [xii.]