Perfect flower; having both stamen and pistil (one or more of each). and producing fruit.
Perfoliate; having the stem apparently pierced through the leaf.
Perianth; a term for the envelopes of a flower, where the calyx and corolla are not clearly distinguishable. Pericarp ; the seed-vessel, or fruit; the ovary in a mature state.
Perigonium; a name for the envelope of the flower; said to be double when there is both calyx and corolla, but often used synonymously with Perianth, which see.
Perigynium; the sac (formed by the union of two bract lets) which incloses the ovary of the Carices. Perigynous petals and stamens. Inserted on the calyx. or rather. adhering to the inner surface of the calyx tube, and thus surrounding the pistils.
.Peripheri(olp fixed or coiled round the circumference, or periphery.
Perisperrn; a deposit in many seeds, affixed to, or sur rounding, the embryo; synonymous with albumen, which see.
Peristome; the circle of teeth or bristle-like processes which surround the orifice of the theca or capsule of the mosses.
Persistent; not falling off: remaining beyond the time when similar organs usually fall off Personate corolla. Masked; having the throat closed by a prominent palate, as in Linaria.
Petal. The (usually) delicat- colored flower leaf. In a flower of one petal (or united petals), the corolla and petal are the same ; in a flower of more than one petal the corolla is the whole and the petals are the parts. Petaloid; petal-like; delicate and colored, or expanded, like a petal.
Petiolar; seated on, or belonging to. the pet'ol Petiolate; having, or being supported on, a petiole; not sessile.
Petiole The stem or foot-stalk of a leaf.
Petiolulate, having a partial or subdivided petiol Petiolule. A little or partial petiole; the foot-stalk of a leaflet.
Plmnogamous, or phanerogamous; having visible genu ine stamens or pistil-; bearing true flowers.
PhyHodium. The imitation. analogue, or substitute of a leaf, usually the dilatedfoliaceoua petiole of an abortive compound leaf.
Pilose; hairy: composed of, or clothed with, distinct, etraight ish hairs.
Pinner. The paired or opposite leaflets of a pinnate leaf. Pinnate leaf; having distinct articulated leaflets in pairs, on opposite sides of a simple petiole.
Pianattfid leaf, or frond. Cleft in a pinnate manner, but the segments united or confluent at base.
P•innattfidly ; in a pinnatifld manner.
Pinnatisect ; pinnately dissected or divided, but the aeg inents not articulated with the petiole.
Pinnules. The leaflets or subdivisions of a bi- tri- or mul ti-pinnate leaf, or frond.
Pistil. The central organ of a fertile flower, consisting usually of ovary, style, and stigma; sometimes the style is wanting, or, in other words, the stigma is sessile.
Pistillate flowers. Those which have pistils, but not stamens.
Pistillifero us ; bearing pistils.
Pitted; having small shallow depressions.
Placenta (plural, placestee). That part of a pericarp to which the seeds are attached; the line or ridge project ing in the cavity of the ovary, which hears the ovules. Placental,' pertaining to the placenta.
Placentiferous ; bearing the placenta.
Plane ; flat, and with an even surf .ce.
Plano-convex ; flat on one aide and convex on the other. Plicate; plaited; folded or crimped, like a fan or ruffle. Plumose; feather-like. A pappue is plumose, when each hair has other hairs arranged on opposite aides of it; as in cirai um.
Pod. A dry seed-vessel, narrow and more or less elon• gated, and usually of two valves. The term is often applied indiscriminately to both legumes and siliquee. Pollen; the fertilizing powder contained in the anthers. Pollen-masses or Pollinia. The waxy masses of pollen in the Asclepias and Orals families.
Poly; in composition, many.
Polyadelphous; having the filaments nnited iu three or more parcels.
Polyandrous; having more than ten hypogynone stamens. Polycolyledonous; having many seed-leaves. Polygamo-dicecious, or dioicons : having perfect and im perfect (or fertile and sterile) flowers on distinct plants.