PARASITE.--An animal or plant living upon or in, and at the expense of,
another organism.
PARTHENOGENESIS.--The production of living organisms from unimpregnated
eggs or seeds.
PEDUNCULATED.--Supported upon a stem or stalk. The pedunculated oak has
its acorns borne upon a footstool.
PELORIA or PELORISM.--The appearance of regularity of structure in the
flowers of plants which normally bear irregular flowers.
PELVIS.--The bony arch to which the hind limbs of vertebrate animals are
articulated.
PETALS.--The leaves of the corolla, or second circle of organs in a flower.
They are usually of delicate texture and brightly coloured.
PHYLLODINEOUS.--Having flattened, leaf-like twigs or leafstalks instead of
true leaves.
PIGMENT.--The colouring material produced generally in the superficial
parts of animals. The cells secreting it are called PIGMENT-CELLS.
PINNATE.--Bearing leaflets on each side of a central stalk.
PISTILS.--The female organs of a flower, which occupy a position in the
centre of the other floral organs. The pistil is generally divisible into
the ovary or germen, the style and the stigma.
PLACENTALIA, PLACENTATA.--or PLACENTAL MAMMALS, See MAMMALIA.
PLANTIGRADES.--Quadrupeds which walk upon the whole sole of the foot, like
the bears.
PLASTIC.--Readily capable of change.
PLEISTOCENE PERIOD.--The latest portion of the Tertiary epoch.
PLUMULE (in plants).
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