Marginal, along or near the edge. Membranaceous, thin, somewhat transparent.

Midrib, the central or main vein of a leaf.

Monadelphous, with all the filaments grown together.

Monocotyledonous, having only one cotyledon in the embryo.

Monoecious, having staminate and pistillate flowers on different parts of the same plant.

Mucronate, tipped with a minute sharp point.

Multlfid, cut into many segments.


Naked, without a covering, as of chaff, hairs, etc. Nerve, a longitudinal line, as on the calyx of Catnip.

Node, the place on a stem from which a leaf springs.

Numerous, indefinite in number.

Nut, an indehiscent fruit of one cell and one seed with a hard shell, usually the product of a compound pistil.

Nutlet, a body like a little nut.


Obcompressed, compressed from above Instead of from side to side. Obcordate, indented at the apex.

Oblanceolate, narrow and tapering towards the base.

Oblique, unequal-sided, slanting.

Oblong, longer than broad, with rather straight sides, and both ends alike.

Obovate, egg-shaped, with the narrow end down.

Obsolete, not evident.

Obtuse, blunt.

Ocreate, having sheathing stipules.

Operculate, having a lid.

Orbicular, circular in outline.

Oval, somewhat longer than broad, with rounded sides and both ends alike.

Ovary, the lower part of the pistil containing the ovules.

Ovate, egg-shaped, the broad end down.

Ovoid, a solid with an ovate outline.


Palate, an upward projection of the lower lip of a personate corolla, closing the throat.

Palet, one of the inner chaffy scales of a grass-flower.

Palmate, with veins or leaflets radiating from the end of the petiole.

Panicle, an irregularly compound inflorescence of pedicelled flowers.

Panicled, resembling a panicle, borne in a panicle.

Papilionaceous, having a standard, wings, and keel, as in leguminous corollas.

Pappus, the tuft of hairs or bristles answering to the calyx-limb in many composite flowers.

Parasitic, living upon other living plants.

Parietal, borne on the walls.

Parted, very deeply cleft.

Pectinate, cut into comb-like narrow teeth.

Pedate, palmately divided or parted, with the basal segments 2-cleft.

Pedicel, a secondary flower-stalk; the support of a single flower in a cluster.

Peduncle, the support of a solitary flower or of a flower-cluster.

Peltate, shield-shaped; attached by the lower surface. Pendulous, hanging down. Perennial, lasting year after year.

Perfect, having both stamens and pistil in the same flower. Perfoliate, with the stem passing through the leaf. Perianth, the floral envelopes. Pericarp, the matured ovary.

Perigyn ous, inserted on the calyx. Persistent, remaining after other parts have fallen away. Personate, applied to a labiate corolla with the throat closed by an upward projection of the lower lip. Petal, one of the pieces of a corolla. Petalold, petal-like. Petiolate, having: a petiole. Petiole, having a leaf-stalk.

Phanerogamous, having flowers and producing seeds.

Pilose, with soft hairs.

Pinna, a primary division of a frond. Pinnate, with veins or leaflets proceeding from each side of a mid-rib. Pinnatifid, deeply pinnately cleft.

Pinnule, a secondary division of a frond; one of the divisions of a pinna. Pistil, the seed-bearing organ of the flower. Pistillate, having pistil but no stamens. Pitted, marked with small pits or depressions. Placenta, the ridge or projection in the ovary to which the ovules are attached.

Plicate, folded into plaits.

Plumose, feathery; with fine hairs on each side of the axis.

Pod, any dry dehiscent fruit.

Pollen, the grains produced in the anther.

Polllnium (plural pollinia), a mass of pollen, as in Milkweeds and Orchids.

Polypetalous, having petals separate from each other.

Pome, an inferior syncarpous fruit with a largely developed adherent calyx, as the apple.

Posterior, the side next the axis.

Procumbent, lying flat on the ground.

Prostrate, the same as procumbent.

Puberulent, minutely pubescent.

Pubescent, covered with fine short hairs.

Punctate, showing transparent dots when held up to the light.

Pungent, acrid to the taste.