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Palmately compound: A compound leaf with three or more leaflets radiating from a common point like fingers from a palm.
Panicle: A compound inflorescence in which the main axis is branched and may support spikes, racemes, or corymbs. Example: garden phlox (Phlox paniculata).
Pappus: In members of the aster family, a reduced calyx that may be comprised of hairs or bristles.
Pedicel: The stalk of a flower.
Peltate: Refers to a leaf having a leafstalk that is attached in the center, giving the leaf an umbrella-like appearance.
Perfect: A flower that contains both the male (stamen) and female (pistil) parts.
Petals: The inner layer of floral parts, often (but not always) brightly colored.
Petiole: The stalk of the leaf.
Petiolule: The stalk of the leaflet.
Phyllary: The bract-like structures found subtending the head (inflorescence) in plants in the aster family.
Pinnately compound: A compound leaf with leaflets arranged on opposite sides of a common rachis (stalk).
Pistil: the female part of a flower; comprised of a stigma, style and ovary.
Pith: The tissue in the center of a stem.
Pollen: Grains containing the male genetic material. They are produced in the anthers.
Pubescent: Having hair.
Pulvinus: An enlargement of the base of the petiole.
Raceme: A simple (unbranched) inflorescence with the flowers along the main axis on stalks).
Rachis: The central axis (stalk) of a compound leaf.
Ray floret: A tubular flower with a strap-like corolla found in members of the Aster family. The structure thought of as a petal on a daisy is actually a ray floret.
Rhizome: A thickened, underground stem, usually with a horizontal orientation.
Rosette: Leaves radiating from a crown or center and usually at or close to the ground.