Pinna (pinna). One of the lateral branches or divisions of a pinnate organ.
Pinnate (pinnatus). With the divisions, leaflets, or branches arranged along each side of the midrib or rachis. Unequally pinnate leaves have a terminal leaflet, equally (abruptly) pinnate ones have none.
Pistil (pistillum). The aggregate of the carpels of a flower.
Placenta (placenta). The part of the ovary or fruit which bears the ovules or seeds.
Plicate (plicatus). Folded along the ribs.
Plumule (plumula). The upper part of the embryo (above the cotyledons).
Pollen (pollen). The fertilizing cells produced in the anthers.
Polygamous (polygamus). Partly hermaphrodite and partly unisexual.
Posterior (posticus). Directed towards the axis upon which the organ in question is inserted.
Praefloration (praeflovatio). The arrangement of the perianth-leaves in the bud.