330 ROCK GARDENS 



coloured, borne in clusters on stems 6 to 8 inches high. Blooms in 

 spring, and foliage dies down early. Of very easy culture, and 

 increased by seed or division. Hardy. 



P. c. Sieboldi. — The Japanese variety of this is synonymous with 

 P. amoena^ which see. 



P. deflexa. — Shady position in moist, sandy loam and leaf-mould. 

 Its leaves, which are hairy on both sides, form a rosette. Flowers 

 rose-purple, in a dense head, which are individually deflexed. It is 

 a biennial, and will require same treatment as P. Cockburniana. 



P. denticulata. — Rich, moist soil in a shady position. Large 

 leaves in rosettes, and globular heads of deep lilac-coloured flowers, 

 on stems about 12 inches high. Blooms in the spring. Quite hardy, 

 and is a very vigorous grower. Easily raised from seed or division. 

 A handsome and valuable plant. 



P. d., var. cashmeriana. — Differs from the last in having the 

 undersides of its leaves thickly coated with a yellow powder, and 

 having rather lighter-coloured flowers. It is also a charming and 

 useful plant, of robust habit and easy culture. P. pulcherrima 

 and P. Henryi are also varieties of P. denticulata^ but neither so 

 good as the above. 



P. deormn. — A bog plant, requiring a very wet position in rich 

 loam and leaf-mould. Leaves long and lanceolate. Rich rosy- 

 purple flowers in large umbels, and very freely produced. Division 

 and seed. A rare and lovely plant. 



P. erosa (syn. P. Fortunei). — Requires an open, sheltered position 

 in light, sandy loam and leaf-mould. Flat heads of light lavender- 

 coloured flowers, with yellow eyes. It is very similar to P. denti- 

 culata^ but may be distinguished from it by its smooth and regularly 

 toothed leaves, which are sometimes quite powdery. Seed and 

 division. 



P. farinosa. — A bog plant for a shady position in rich, moist loam, 

 or it can be planted in a moist crevice between rocks. The leaves, 

 which form a rosette, are covered with a silvery-white powder, as is 

 the rest of the plant. Dense umbels of lilac-coloured flowers, with 

 a yellow centre, borne on stems 8 inches high, are freely produced 

 in May and June. Of easy culture, and can be increased by seed 

 or division. A very lovely plant, /*. farinosa^ var. Scotia^ has 

 deeper-coloured flowers, and is of dwarfer habit. 



P. frondosa. — Likes a half-shady position in moist, sandy peat 

 and loam. Similar to P. farinosa^ except that its leaves are larger. 

 It is of vigorous habit and easy culture. Readily increased by 

 division. 



P, Forresti. — Shady position in moist, sandy loam. The flowers, 

 which are of a rich golden-yellow, shading to deep orange, are borne 

 in umbels, the individual flower slightly deflexed. Flower-stem 



