342 ROCK GARDENS 



inches high. Handsome white flowers, borne singly on stems about 

 8 inches high. Pit)pagated by division, and of fairly easy culture. 

 It derives its name from the red juice that is in the leaves and 

 stems. 



Santolina (Compositae), Lavender Cotton 



A genus of shrubs which mostly have yellow flowers and silvery 

 foliage. They grow about 2 feet high, and are of easy culture. 

 Propagated by cuttings. They are useful for parts of the rock 

 garden, but should not be associated with any of the choicer plants. 

 The following are suitable: — S. Chamaecyparissus^ S. c. incana^ 

 S. c. Squarrosa, S. c. tomentosa, and S. rosmarinifolia. 



Saponaria (Caryophylleae), Soapwort 



A genus of plants nearly allied to the Pinks. Easily propagated 

 by division or seed. 



S. Boissieri. — Sunny position in light sandy loam. Of vigorous 

 and spreading habit. Flowers bright pink. Of easy culture. 



6". caespitosa. — Sunny position in light sandy soil. Forms rosettes 

 3 to 6 inches high of glabrous leaves. Flowers rose-coloured, on 

 short stalks, in July. Hardy, and a pretty little plant. 



S. lutea, — Sunny aspect in sandy soil. Compact habit, and only 

 grows from 3 to 6 inches high. Leaves narrow. Yellow flowers 

 with a woolly calyx. Not very hardy. 



S. ocymoides. — Sunny position in deep loamy soil. Prostrate, 

 trailing habit. Flowers rose-coloured and very numerous, and 

 produced from May to August. Of very easy culture, and quite 

 hardy. Should be planted so that its trailing stems can fall over a 

 rock. A very pretty and valuable species. There is a variety, 

 splendidissima, even better than the type. 



S. wienmanniana. — Loam in sunny position. Bears pink flowers. 



Sarracenia (Sarraceniaceae), Pitcher Plant 



A few species of this orchid are fairly hardy in favoured localities 

 and may be grown in the bog garden in moist peat and sphagnum, 

 in a sheltered position. The following are the best species to try : 

 — S. Driimmondi^ S. purpurea^ and S.fiava. 



Saxifraga (Saxifragaceae) 



This very large genus of dwarf-growing plants is of the greatest 

 possible value for the rock garden. There are over three hundred 

 species, so it is not surprising that considerable confusion exists as 



