| Name | Structure/ Category | Description |
|---|---|---|
| Peduncle | The main stalk of a multi-flower inflorescence or of a cluster of flowers within an inflorescence. | |
| Peltate | [Leaf bases, Leaflet bases] {shape} | Having the leaf stalk (petiole) attached to the lower surface of the leaf, usually near the center. |
| Pepo | [Fruits] {type} | A specialized berry with a hard or leathery rind and a fleshy interior surrounding a mass of seeds, without interior sections or locules, as melons and cucumbers (Cucumis). |
| Perennial | continuing or lasting for several years--used specif. of a plant (as delphinium) that dies back seasonally and produces new growth from a perennating part | |
| Perfoliate | [Leaf bases, Leaflet bases] {shape} | Having the base completely surrounding the stem, so that the stem appears to pass through the leaf. |
| Perfoliate | Where the bases of two opposite leaves wrap completely around the stem. It is also possible for the base of an alternate leaf to wrap completely around a stem, but this is less common. | |
| Perianth | The collective term for the outer sterile parts of a flower, comprising the calyx (sepals) and the corolla (petals) when both whorls are present. | |
| Perigynium | the saclike bract that subtends the pistillate flower of sedges of the genus Carex and that in fruit becomes a flask-shaped envelope investing the achene | |
| Perigynous | [Flowers] {perianth position} | With the free portion of the perianth (the whorl of sepals and petals) borne at the top of a floral cup which is either a) fused to and partially encloses the ovary (the perianth thus appearing to arise at a level between the bottom and top of the ovary), or b) free from the ovary and extending up and around it to some extent. |
| Persistent | (1) [Petals, Sepals, Stipules] {persistence} | Remaining attached; not falling off early, as stipules that remain attached while the leaves are attached. |
