272 ROCK GARDENS 



D. integrefolia. — Moist, peaty loam and stone chips in half 

 shade in the bog garden. Tufts of small, rather oval, and entire 

 leaves. Clusters of rosy-crimson flowers, on stems 4 to 6 inches 

 high, in early summer. This is the best of the genus and the most 

 difficult to cultivate. Easily raised from seed, which it ripens freely. 



D. Jeffreyi. — Has larger and thicker leaves than the type, and 

 of a darker green. Flowers rich, dark rose colour, borne on 

 stems 18 inches to 2 feet high. The largest of the genus, and a 

 good plant for a sheltered spot in the bog garden, where its big 

 leaves will not be torn by the wind. 



D. Meadia (Shooting Star). — Varies a good deal in the colour of 

 its flowers, in shades varying from lilac to purplish-rose. Quite 

 hardy, and of easy culture and readily grown from seed. This 

 well-known plant should find a place in every bog garden. 



DoNDiA Epipactus (syn. Hacquetia) 



A dwarf-growing plant about 4 inches high, very distinctive on 

 account of the bright yellow involucre which surrounds its rather 

 insignificant greenish-yellow flowers. It is quite hardy, and easily 

 grown in stiff loam, and is one of our earliest plants to flower. 



Draba (Cruciferae), Whitlow Grass 



A genus of minute plants, with white or yellow flowers, requiring 

 sandy soil in full sun, and should be associated with the dwarfest- 

 growing plants. 



D. aizoides. — Sandy soil on a sunny bank. Forms dense little 

 tufts about 3 inches high. Slow to increase. Flowers freely produced, 

 and of a bright yellow colour, in March. Increased by division and 

 seed. 



D. Aizoon. — Sun, in sandy soil. Forms compact rosettes of dark 

 green, stiff little leaves, with small, bright yellow flowers, on 3-inch 

 stems. A pretty and very early flowering little plant, of easy 

 culture, and readily raised from seed, which it ripens freely. 



D. alpina. — Well-drained chinks in the rock garden, in light soil, 

 and sun. Grows about 2 inches high. Dark green leaves and 

 bright golden flowers. A delicate and difficult plant to grow. 

 The attacks of slugs should be guarded against. Nearly allied to 

 this is D. aurea^ with taller-growing flowers, and less compact 

 habit. 



D. ciliata. — Has white, diminutive flowers. Growth only about 

 2 inches high. 



D. cinerea (syn. D. borealis). — Good white flowers, and dark 

 green leaves, of free-growing habit. Seeds and division. Biennial. 



