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Perennial
A term that usually refers to non-woody plants that live for more than two years or three seasons. Flowering annually, perennial plants tend to die down during the winter, but have roots that will survive low temperatures.
Perfoliate
A pair of leaves attached to either side of a stem that have their bases fused, so they encircle it.
Perianth
The collective term used to describe the external floral parts of a flower, which includes the calyx and corolla. In a tulip, the combined sepals and petals are known as the perianth.
Petal
A flower leaf. Part of the corolla of a flower, surrounding the reproductive organs. The petal itself is non-reproductive, but has a role in attracting insects and is often coloured.
Petiole
Leaf stalk connecting base of leaf to main stem of the plant. Usually green in colour, and may have flared 'wings' which connect to the leaf.
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