_Glands._ Small cellular organs which secrete oily, aromatic, or other products. They are sometimes sunk in the leaves, etc., as on the Prickly-ash; sometimes on the surface as small projections; sometimes on the ends of hairs. The word is also used to indicate small swellings, whether there is a secretion or not. _Glandular._ Having glands. _Glandular-hairy._ With glandular-tipped hairs, 23. _Glaucous._ Covered with a fine white powder that rubs off, 23. _Globose._ Spherical in form. _Globular._ Nearly globose. _Glutinous._ Covered with a sticky gum. _Hairy._ Having rather long hairs, 23. _Halberd-shaped_, 21. _Head._ A compact, rounded cluster of flowers or fruit, 26. _Heart-shaped._ Ovate, with a notched base; cordate, 21. _Heart-wood_, 13, 35. _Herbaceous._ Without woody substance in the stem; like an herb; soft and leaf-like. _Hybrid._ An intermediate form of plant between two nearly related species; formed by the action of the pollen of one upon the pistil of the other. _Imbricated._ Overlapping one another like the shingles on a roof, 28. _Incised._ Irregularly and deeply cut, as the edge of a leaf. _Incurved._ Gradually curving inward. _Indefinite annual growth_, 30. _Indehiscent._ Not splitting open. _Inflexed._ Bent inward, 33. _Involucre._ A whorl or set of bracts around a flower, a cluster of flowers, or fruit, 27. _Involute._ Rolled inward from the edges, 34. _Irregular._ Said of a flower which has its corolla of different sized, shaped, or colored pieces, 25. _Kernel._ The substance contained within the shell of a nut or the stone of a fruit. _Key._ A fruit furnished with a wing, or leaf-like expansion, 28. _Kidney-shaped._ Broadly heart-shaped, with the apex and basal notch somewhat rounded. _Lacerated._ With a margin irregularly notched or apparently torn. _Laciniate._ Cut into narrow lobes; slashed. _Lance-shaped._ _Lanceolate._ Like a lance-head in shape, 21. _Leaf_, 17; arrangement of leaves, 18; bases of, 21; forms of, 20; kinds of, 19; margins of, 22; parts of, 19; points of, 22; veining, 19. _Leaflet._ A separate blade of a compound leaf, 20. _Leafstalk._ The stem of a leaf; petiole, 19. _Legume._ A pea-like pod, 28. _Lensform._ _Lenticular._ Thickest in the center, with the edges somewhat sharp; like a double-convex lens. _Linear._ Long and narrow, with the edges about parallel, 20. _Lobe._ The separate, projecting parts of an irregularly edged leaf if few in number, 22. _Lobed._ Having lobes along the margin, 22. _Margin of leaves_, 22. _Medullary rays_, 13. _Membranous._ Thin and rather soft, and more or less translucent, 23. _Midrib._ The central or main rib of a leaf, 19. _Monoecious._ With both pistillate and staminate flowers on the same plant, 25. _Monopetalous._ With the corolla more or less grown together at the base; gamopetalous, 25. _Mucronate._ Tipped with a short abrupt point, 22. _Multiple roots_, 9.