LAMINA, the blade of the leaf; the broad part of the petal or sepal. LANCEOLATE, tapering to each end, but broadest _below_ the middle. LATERAL, arising from the side of the axis, not terminal. LATEX, granular fluid contained in laticiferous vessels. LATICIFEROUS, vessels containing latex which is anastomose. LAX, not compact. LEAFLETS, the small portions of compound leaves. LEGUME, a pod composed of one carpel, opening usually by a ventral and dorsal suture, as in the pea. LEGUMINOUS, plants bearing pods. LENTICEL, a small cellular process on the bark of the willow and other plants. LENTICULAR, in the form of a doubly-convex lens. LEPIDOTE, covered with scales or scurf. LIANES, twining woody plants. LIBER, the fibrous inner bark of endophlœum. LID, the calyx which falls from the flower in one piece. LIGNINE, woody matter which thickens the cell walls. LIGULATE, strap-shaped. LIGULE, a process arising from the petiole of grasses, where it joins the blade. LIGULIFLORÆ, composite plants having ligulate florets. LIMB, the blade of the leaf; the broad part of a petal or sepal. When sepals or petals are united, the combined broad parts are denominated collectively the limb. LINE, the twelfth part of an inch. LINEAR, very narrow when the length greatly exceeds the breadth. LINGUIFORM, strap-shaped. LIPPED, having a distinct lip or labellum. LOBE, large division of a leaf or any other organ, applied often to the divisions of the anther. LOCULAMENTS, divisions of the cells of a seed-vessel. LOCULICIDAL, fruit dehiscing through the back of the carpels. LOCULUS, a cavity in an ovary. The terms are also applied to the anther. LOCUSTA, a spikelet of grasses. LODICULE, a scale at the base of the ovary of grapes. LOMENTUM, an indehiscent legume or pod with transverse partitions, each division containing one seed. LURID, a color combining yellow, purple, and gray. LYRATE, a pinnatifid leaf with a large terminal lobe, and smaller ones as we approach the petiole. M MACROPODOUS, applied to the thickened radicle of a monocotyledonous embryo. MARCESCENT, withering, but not falling off until the part bearing it is perfected. MEDULLA, the pith. MEDULLARY RAYS, cellular prolongation uniting the pith and the bark. MEDULLARY SHEATH, sheath containing spiral vessels, surrounding the pith in exogens. MEMBRANEOUS, having the consistence, aspect, and structure of a membrane. MERICARP, carpel forming one-half of the fruit of _Umbelliferæ_. MERITHAL, a term used in place of internode; applied by Gaudichaud to the different parts of the leaf. MESOCARP, middle covering of the fruit. MESOCHILUM, middle portion of the labellum of orchids. MESOPHLŒUM, middle layer of bark. METRE, equal to 39.3707 inches British. MICROMETER, instrument for measuring microscopic objects.