DESCRIPTIVE AND SELECTIVE. 203 



CHEIRANTHUS (V^allflower).— The rich and 

 fragrant old Wallflower is^ of course, a prime favourite 

 for spring bedding, and for this purpose it may be 

 reserved, but one or two of the other species, notably 

 Alpinus and Marshalli, may be grown in the rock 

 garden. They have much of the brilliance, but not 

 the rich fragrance, of the lighter-coloured Wallflowers. 

 The former has pale yellow flowers, which it bears in 

 spring. It is, as its name implies, Alpine, and may be 

 increased by division. The latter is of hybrid origin. 

 It is neither so free-growing nor so long-lived a plant 

 as the other, but even Alpinus tends to die out on damp 

 soil. Marshalli is best propagated by cuttings. Both 

 species share the love of the Wallflower for light, dry 

 soil. They enjoy limestone, and will thrive, like the 

 Wallflowers, on dry chalky banks. If it comes to 

 growing plants actually on walls the Wallflowers 

 themselves may be given preference. It is only 

 necessary to give a reminder of how readily they come 

 from seed sown out of doors in spring. They make 

 the best plants when transplanted during showery 

 weather in summer, but seeds may be scattered where 

 they are to bloom if more convenient. A yellow 

 should always be sown in addition to a dark variety. 



CRYSANTHEMUM ALPINUM.—A very dwarf 

 and compact Ox-eye Daisy (see coloured plate); 

 thrives in gritty loam and may be increased by 

 division. 



CISTUS (Rock Rose). — These Httle shrubs are 

 admirably adapted for rock gardens, and have the 

 advantage (a considerable one in the case of a great 



