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Paeonia - Paeonies
 

Paeonia is the only genus of the family Paeoniaceae.  They are native to Asia, S-Europe and western N-America. Most are perennials, but a few are shrubs that can reach 3 m in height. Their flowers are large and colourful and a great number of cultivars are grown in gardens. 

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Papaver - Poppies
 

Papaver is a genus of around 100 species in the poppy family, Papaveraceae, native to Eurasia and a few native to N-America. They are drought tolerant plants with a long taproot that prefer full sun. 

 

Paradisea
 

Paradisea, is a genus of two species in the family Asparagaceae, which are both native to S-Europe. 

 

Penstemon - Beardtongues
 

Penstemon is a genus in the family Plantaginaceae.  It is a large genus native to N-America. They are usually low growing herbaceous plants or sub-shrubs with irregularly shaped flowers. They prefer full sun and many are well suited to rock gardens. 

 

Phlox
 

Phlox is a genus in the family Polemoniaceae.  All species except one are native to N-America and grow in various habitats. 

 

Phyteuma - Rampion
 

Phyteuma is a genus in the bluebell family, Campanulaceae, native to mountains in Central-Europe, many in the Alps.

 

Polemonium - Jacob's ladder
 

Polemonium is a genus in the Polemoniaceae family. All species are native to temperate regions in the northern hemisphere, except one species that grows in the southern Andes. 

 

Polygonatum - Solomon's seal
 

Polygonatum is a genus in the family Asparagaceae. Species of the genus are distributed around temperate regions in the northern hemisphere, the majority in Asia. They are woodland plants that grow best in shade. 

 

Potentilla - Cinquefoils
 

Potentilla is a large genus in the rose family, Rosaceae, distributed around the northern hemisphere. Most species have yellow flowers, but a few bloom white, pink or red flowers. They grow best in full sun if fairly dry, poor soil. 

 

Primula - Primroses
 

Primula, is a very large genus of around 500 species in the primrose family, Primulaceae. The genus has a wide distribution, but the majority, about half the species, are native to the Himalayas. They grow in varied habitats, some are excellent rock garden plants, while others thrive in deep, fertile soil in semi-shade. The majority is not drought tolerant.

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Pulmonaria - Lyfjurtir
 

Pulmonaria is a genus in the family Boraginaceae, native to Europe and western Asia. They are spring flowering, shade tolerant woodland plants. 

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Pulsatilla - Pasqueflowers
 

Pulsatilla is a genus in the buttercup family, Ranunculaceae, native to meadows and prairies in N-America, Europe and Asia. They are toxic, like many other plants in the buttercup family.