424 
PHARMACEUTICAL BOTANY 
Leaf. —An expansion of the stem or branch in whose axil one or more branches 
arise. 
Leaf'let.— A division of a compound leaf. 
Leaf-Trace. —A fibro vascular bundle while on its way from the stem bundle to 
the leaf. > 
Leg'ume. —A dry, simple capsular fruit formed of a single carpel and dehiscent 
by both ventral and dorsal sutures. 
Len'ticels. —Fissures in the cork of Dicotyledons formed by the swelling up and 
rupture of secondary cortex cells beneath. 
Lentic'ular. —Having the shape of a double convex lens. 
Leu'coplast. —A colorless plastid found in the cells of plants not exposed to light. 
Li'ane. —A woody climber or twiner of tropical forests. 
Li'ber. —The inner bark or phloem region of Gymnosperms and Dicotyledons. 
Li'briform-Cells. —Those cells of the xylem that are thick walled and resemble 
bast-fibers. 
Lig'neous. —Woody. 
Lig'nified. —Covered with deposits of lignin. 
Lig'nin. —A substance that adheres to the cellulose walls of certain cells and 
which is characterized by taking on a reddish coloration with phloroglucin 
and hydrochloric acid. 
Lig'ulate. —Strap shaped. 
Lig'ule. —A membranous appendage at the summit of the leaf-sheath in many 
grasses and cereals; a strap shaped corolla of a Composite. ^ 
Liguliflo'rous. —Applied to Compositae flower heads, as those of Dandelion and 
Chicory, which contain ligulate florets only. 
Limb. —The spreading portion of a gamosepalous calyx or a gamopetalous 
corolla. 
Line. —One-twelfth of an inch. 
Lin'ear. —Many times longer than broad and with nearly parallel rfiargins. 
Lobe. —A division of a leaf or other flattened organ which is larger than a tooth 
but which is not a leaflet. 
Loc'ular. —Having a cavity or cavities. 
Loculici'dal. —Applied to the deshiscence of a capsule when it splits open along 
the dorsal suture. 
Loc'ulus. —A cell or cavity of an anther, ovary, or fruit. 
Lo'ment. —A modified jointed or multilocular legume that breaks open trans¬ 
versely into segments when mature. 
Lu'cid. —Clear. 
Lu'niform. —Half-moon or crescent shaped. 
Lu'rid. —Dingy-brown. 
Lutes'cent. —Yellowish. 
Ly'rate. —Applied to a piiinatifid leaf, as that of the Turnip, in which the term¬ 
inal lobe is the largest and the rest decreasing in size toward the base. 
Lysig'enous. —Applied to the formation of a type of intercellular-air-space 
