| Name | Structure/ Category | Description |
|---|---|---|
| Phyllode | a flat expanded petiole that replaces the blade of a foliage leaf, fulfills the same functions, and is analogous to but not homologous with a cladophyll | |
| Phytomelanin | a papery "sooty" black layer over the seed of plants in the Asparagales, which includes agaves, aloes, onions and hyacinths. It is an important character for defining the group. | |
| Pilose | [Buds, Leaf lower surface, Leaf upper surface, Petioles, Phyllaries, Rachises, Sepals, Young twigs] {pubescence type} | With soft, more or less straight hairs. |
| Pinked | with a saw-toothed edge | |
| Pinna | a leaflet or primary division of a pinnate leaf or frond | |
| Pinnate | (1) With several leaflets, lobes or other structures positioned along and on either side of a central axis; arranged or structured in a feather-like pattern. | |
| Pinnate | (2) [Leaf venation, Leaflet venation] {form} | With secondary veins arising from a single, large midvein. |
| Pinnately lobed | [Leaflets] {lobing form} | With several main segments or lobes positioned along and on either side of a central axis; lobed in a feather-like pattern. |
| Pinnatifid | With several lobes positioned along and on either side of a central axis; lobed in a feather-like pattern. | |
| Pistil | The female or ovule-bearing organ of a flower, typically composed of an ovary, style and stigma. |
