ALPHABETICAL LIST OF PLANTS 271 



are also numerous garden hybrids, pinks rather stronger-growing 

 than most of the above, but in the larger rock gardens should be 

 used in big masses. The following are some good kinds : — " Her 

 Majesty, ^^ large white ; " Mrs SiT?ikins" well known, fragrant 

 white pink ; " Nellie " ; " Edmond Matthewii^^ crimson, with a 

 darker crimson blotch, very handsome ; and many others. 



DiAPENSiA Lapponica (Diapenseaceae) 



A rare little evergreen shrub of very dwarf habit. Requires 

 damp, peaty, and gritty soil in open position. It grows in dense, 

 rounded tufts, with narrow leaves, i to 2 inches high. Cup-shaped, 

 solitary flowers, pearly-white, with yellow stamens, in the summer. 

 Hardy, but not easy to cultivate. Easily raised from seed. 



DiCENTRA (syn. Dielytra), Papaveraceae 



A genus of graceful-growing plants, useful for wilder part of the 

 rock garden. The following are a selection of the best kinds : — 



D. canadensis. — Grows about 6 inches high. Flowers white, in 

 May. Leaves glaucous. 



D. exima. — Shady position, rich, sandy soil. Pretty, fern-like 

 foliage. Grows 12 to 18 inches high. Reddish-purple flowers, 

 borne in long drooping racemes. 



D. for7nosa. — Dwarfer-growing form of the above, with lighter- 

 coloured flowers. Requires same treatment and position. 



D. spectabilis. — A well-known plant, with its pink, heart-shaped 

 blooms, which gives it the popular name of "the bleeding heart." 



DiPHYLLEiA CYMOSA (Berberidaceae), Umbrella Leaf 



A dwarf plant, growing about 9 inches high, of the Barberry 

 family. It likes very moist peat and is suitable for edges of streams 

 or in the bog garden. Large, umbrella-like leaves, arranged in 

 pairs, and loose clusters of white flowers, in June, succeeded by 

 dark blue berries. 



DoDECATHEON (Primulaceae), American Cowslip 



Attractive and distinct plants, very closely allied to the Primulas. 

 They are all of easy culture in cool, half-shady, and rather moist, 

 sandy, and leafy soil. They all have clusters of flowers like 

 Cyclamens, borne on the top of upright stems. 



D. Hendersoni. — Clusters of Cyclamen-like, rich, deep crimson 

 flowers, on stems about 12 inches high. 



