Hair

capillary expansions of cellular tissue, which coat the surface of various parts of many plants.

Hastate

shaped like the head of a halbert, the base diverging on each side into an acute lobe.

Herbaceous

not woody; any portion of a plant which is more particularly green and succulent.

Hermaphrodite

where both stamens and pistil occur in the same flower.

Hiemal

belonging to winter.

Hirsute

hairy.

Hispid

hairy, the hairs long and rigid.

Hoary

greyish-white.

Horizontal

when a plane surface lies perpendicularly to the axis of the body which supports it, as most leaves.

Homy

of a hard close texture, resembling horn.

Hypocrateriform

that form (of corolla) in which the tube is long and cylindrical, and the limb flat, spreading at right angles to it.

Hypogynous

seated below the base of the ovary, but not attached to the calyx.

Imbricate

overlapping. Immersed, when one part or organ is completely imbedded in another. Impari-pinnate, unequally pinnate, that is, pinnate with an odd terminal leaflet. Incised, cut. Incurved, gradually bending from without inwards. Indefinite, where the number of any particular description of organ is uncertain. Indehiscent, without dehiscence, or regular line of suture. Inferior, placed below another organ; used especially to express the connection of the tube of a calyx with the ovary. Inflated, bladdery. Inflorescence, the general arrangement or disposition of the flowers. Interrupted, having symmetry or regularity of outline or composition partially destroyed. Involucel, a partial involucre. Involucre, a whorl of bracts, free or united, seated on the peduncle, either near to or at some distance below the flower or flowers. Involute, rolled inwards at the edge, as some leaves. Irregular, wanting symmetry; also unequal. Isomerous, having an equal number of parts. Joints, certain parts where the uniformity of the tissue is altered, and where it may readily be ruptured or falls asunder in decay. Keel, a projecting ridge, rising along the middle of a flat or curved surface; also the two lowermost and more or less combined petals of a papilionaceous corolla. Keeled, furnished with a keel. Knotted, swollen at intervals into knobs, somewhat resembling a knotted cord. Labellum, the lip of a flower. Labiate, a tubular calyx or corolla with the limb divided into two unequal portions, or lobes placed above and below, like the lips of a mouth. Lanceolate, narrow and tapering at each end, like the head of a spear. Lateral, fixed on or near the side of any organ. Lax, loose.

Leaf

an appendage to the stem, composed of cellular tissue with fibres of vascular tissue intermixed. Leaflet, each separate portion or subordinate expansion in the limb of a compound leaf. Legume, the one-celled and two-valved seed-vessel of Leguminosae. Lenticular, of the form of a double-convex lens. Leprous, covered with flat scurfy-scales. Lignle, a membranous appendage at the summit of the sheathing petiole, in grasses. ligulate, strap-shaped. Limb, the superior flat expanded part of a petal or leaf. Linear, having the margins parallel, and the length considerably longer than the breadth. Lip, a term applied to each of the two large divisions of an unequally parted monocetalous eorolla; also applied to one of the segments of an irregular perianth, when of a shape remarkably different from the rest, as in Orchids. Lobe, a rounded projecting part of some organ. Lobed, divided into lobes. Loose, having the separate parts arranged at some distance from each other upon a common axis. Lurid, of a dingy brown; grey with orange. Lyrate, having several pairs of small lobes near the base, with deep sinuses between them. Marginal, placed upon, or attached to, the edge of any thing. Mealy, covered with a scurfy powder. Membranaceous, Membranous, thin, and more or less transparent. Mericarp, one of the carpels in the fruit of Umbellifers. Midrib, the principal nerve or vein, which runs from the base to the apex of a leaf. Milk, an opaque white juice, found in many plants. Monadelphous, having the filaments of the stamens all united in one set or bundle. Monochlamydeous, having only one whorl to the perianth. Monocotyledons, plants whose seeds have only one cotyledon. Monocotyledonous, possessing but one cotyledon. Monopetals, a group of dicotyledons, in which the corolla is monopetal-ous. Monoecious, bearing two kinds of unisexual flowers on the same individual plant.