724 PHARMACEUTICAL BOTANY 
Kner.—A form of knot which projects upward into the air from the roots of certain 
trees that grow in wet soil, notably the bald cypress. 
LaseL’LuM.—The large, lip-like, lower petal in the flower of an orchid. 
La’BIATE.—Two lipped. 
La’srum.—The lower lip of a labiate flower. 
Lacin‘1ATE.—Applied to the margins of leaves which are deeply cut into irregular 
narrow lobes. 
LameEt’L#.—Little plates or layers. Applied to the layers of carbohydrate material 
in a starch grain which surround the growing point; also to the gills of 
a toad-stool as well as to the more or less regular markings found in cell walls 
formed by delicate layers of material of different water content or of different 
composition. : 
Lam’tnA.—The blade or expanded part of any leaf. 
La’nATE.—Covered with long, curled, wool-like hairs. 
LAN’cEOLATE.—Lance-shaped. 
La’tex.—The milk juice of a plant. 
Laticir’ERous.—Applied to the latex carrying tissue of a plant. 
LAtiFo’LIATE.—Possessing broad leaves. 
Lrear.—An expansion of the stem or branch in whose axil one or more branches 
arise. 
Lear’Let.—A division of a compound leaf. 
Lear-TRAce.—A vascular bundle while on its way from the stem bundle to the leaf. 
Lec’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 or epidermis of stems formed by the swelling up 
and rupture of subjacent cells which were cut off by the phellogen in places 
where cork was not laid down. 
LenTIc’ULAR.—Having the shape of a double convex lens. 
Lrep’trome.—The conducting tissue of the phloem, comprising sieve tubes, phloem 
parenchyma and sometimes companion cells. 
Lev’cop.ast.—A colorless plastid found in the cells of plants not exposed to light. 
Li’ANE.—A woody climber or twiner of tropical forests. 
Li’ser.—The inner bark or phloem region of Gymnosperms and Dicotyledons. 
Li’srirorM-Cetis.—Those cells of the xylem that are thick-walled and resemble 
bast fibers. 
Lic’NEOus.—Woody. 
Lic’niF1ep.—Covered with deposits of lignin. : 
Lic’n1n.—A mixture of substances that adheres to the cellulose walls of certain cells 
’ and which is characterized by taking on a reddish coloration with phloroglucin 
and hydrochloric acid reagent. 
Lic’uLATE.—Strap-shaped. 
Lic’utr.—A membranous appendage at the summit of the leaf-sheath in many 
grasses and cereals; a strap shaped corolla of a Composite. 
LicuLirLo’Rous.—Applied to Composite flower heads, as those of Dandelion and 
Chicory, which contain ligulate florets only, ; 
Lims.—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 margins. . 
