aphy_, relates to characterizing and describing plants.

_Phyton_, or _Phytomer_, a name used to designate the pieces which by
their repetition make up a plant, theoretically, viz. a joint of stem
with its leaf or pair of leaves.

_Pileus_ of a mushroom, 172.

_Piliferous_, bearing a slender bristle or hair (_pilum_), or beset with
hairs.

_Pilose_, hairy; clothed with soft slender hairs.

_Pinna_, a primary division with its leaflets of a bipinnate or
tripinnate leaf.

_Pinnule_, a secondary division of a bipinnate or tripinnate leaf, 66.

_Pinnate_ (leaf), when leaflets are arranged along the sides of a common
petiole, 57.

_Pinnately lobed_, _cleft_, _parted_, _divided_, _veined_, 56.

_Pinnatifid_, _Pinnatisect_, same as pinnately cleft and pinnately
parted, 56.

_Pisiform_, pea-shaped.

_Pistil_, the seed-bearing organ of the flower, 14, 80, 105.

_Pistillate_, having a pistil, 85.

_Pistillidium_, the body which in Mosses answers to the pistil, 159,
164.

_Pitchers_, 64.

_Pith_, the cellular centre of an exogenous stem, 138.

_Placenta_, the surface or part of the ovary to which the ovules are
attached, 107.

_Placentiform_, nearly same as quoit-shaped.

_Plaited_ (in the bud), or _Plicate_, folded, 72, 98.

_Platy-_, Greek for broad, in compounds, such as _Platyphyllous_,
broad-leaved, &c.

_Pleio-_, Greek for full or abounding, used in compounds, such as
_Pleiopetalous_, of many petals, &c.

_Plumbeus_, lead-colored.

_Plumose_, feathery; when any slender body (such as a bristle of a
pappus or a style) is beset with hairs along its sides, like the plume
of a feather.

_Plumule_, the bud or first shoot of a germinating plantlet above the
cotyledons, 13.

_Pluri-_, in composition, many or several; as _Plurifoliolate_, with
several leaflets.

_Pod_, specially a legume, 122; also may be applied to any sort of
capsule.

_Podium_, a footstalk or stipe, used only in Greek compounds, as
(suffixed) _Leptopodus_, slender-stalked, or (prefixed) _Podocephalus_,
with a stalked head, and in _Podosperm_, a seed stalk or funiculus.

_Pogon_, Greek for beard, comes into various compounds.

_Pointless_, destitute of any pointed tip, such as a _mucro_, _awn_,
_acumination_, &c.

_Pollen_, the fertilizing powder contained in the anther, 14, 80, 103.

_Pollen-growth_, 117. _Polleniferous_, pollen-bearing.

_Pollen-mass_, _Pollinium_, the united mass of pollen, 104, as in
Milkweed and Orch