l._ The stem of each flower of a cluster, 26.

_Peduncle._ The stem of a solitary flower, or the main stem of a
cluster, 26.

_Pellucid._ Almost or quite transparent.

_Peltate._ Applied to a leaf or other part when the stem or stalk is
attached within the margin on the side.

_Pendent._ Hanging downward, 28.

_Pendulous._ Hanging or drooping.

_Perfect._ Said of a flower with both stamen and pistil, 25.

_Petal._ A leaf of the corolla of a flower, 25.

_Petiole._ The stalk or stem of a leaf, 19.

_Petiolate._ Said of a leaf which has a stem, 20.

_Pinnae._ The first divisions of a bipinnate or tripinnate leaf.

_Pinnate leaf._ A compound leaf with the leaflets arranged along the
sides of the stem, 19.

_Pinnately lobed_, 22; _Pinnate-veined_, 20.

_Pinnatifid._ A leaf deeply notched along the sides in a pinnate manner,
23.

_Pistil._ The central essential organ of a flower, 25.

_Pistillate._ A flower with pistil but no stamens, 25.

_Pith_, 12.

_Plicate._ Folded like a fan, 34.

_Pod._ A dry dehiscent fruit like that of the pea, 28.

_Points of leaves_, 22.

_Pollarding trees_, 31.

_Pollen._ The dust or fertilizing material contained in the anther, 24.

_Polypetalous._ Having a corolla of separate petals, 25.

_Pome._ An apple-like fruit with the seeds in horny cells, 27.

_Preparation of a collection_, 35.

_Pressing plants_, 36.

_Prickles._ Sharp, spine-like elevations on the bark, leaf or fruit, 28.

_Primary root_, 10.

_Pubescent._ Hairy or downy, especially with fine soft hairs or
pubescence, 23.

_Pulp._ The soft flesh of such fruits as the apple or cherry.

_Punctate._ With translucent glands, 23.

_Pyramidal._ With sloping sides like a pyramid, but with a circular
base; broad-conical.

_Raceme._ A flower-cluster with one-flowered stems arranged along the
peduncle, 26.

_Radial section of wood_, 35.

_Radiating ribs._ The ribs of a leaf when several start together at or
near the base. A leaf having such ribs is said to be radiately or
palmately veined, 20.

_Rapier-shaped._ Narrow, pointed, and curved like a sword.

_Recurved_ or _reflexed_. Bent backward, 28.

_Regular._ Said of a flower which has its enveloping organs alike on all
sides, 25.

_Repand._ Wavy-margined, 22.

_Retuse._ With a slightly notched tip, 22.

_Revolute._ Rolled backward, as the edges of many leaves, 22, 34.

_Ribbed._ With prominent ribs, often somewhat parallel.

_Ribs._ Th