Phyllon (plural, phylla), Greek for leaf and leaves; used in many compound terms and names.
Phyllotaxis, or Phyllotaxy, the arrangement of leaves on the stem, [67].
Physiological Botany, [9].
Phytography, 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].