CRUCIFERzE. 45 



should be diligently cut away as soon as they appear, othenvise 

 they injure the eftect of the foliage. Propagate in the same 

 way as the preceding. There are many finer plants in the 

 same colour of variegation for massing and edging; but it 

 makes a pleasing variety in the front lines of mixed borders of 

 hardy perennials. 



Cardamine [Bitter-Cress). — This is a large genus, yielding, 

 however, very few species of much value for embellishment. 

 They are plants of easy cultivation, succeeding very fairly in 

 most soils and situations if not dry in the extreme, but are 

 best adapted for moist or even marshy places. Propagate by 

 seed in March or April in the open ground, or by division any 

 time from autumn till spring. 



C. pratensis ^oie-^\eno {Double-flowered Bitter- Cress). — This 

 is a very pretty pleasing plant, with little that is showy about 

 it, but no little grace. The simple-flgwered form is rather a 

 common plant in moist places in Britain generally, but the 

 double variety is not met with in nature, and not often even in 

 cultivation. It is a pretty ornament of rockwork or moist 

 borders. The leaves are pinnate, pale green; the flower-stems 

 rise to the height of about 9 inches, bearing numerous flowers 

 in open trusses. The flowers are pale pinkish purple, or white 

 tinged with that colour, and are rather large, appearing in 

 April and continuing far into summer. 



C. trifolia {Trifoliate-leaved Bitter- Cress). — This is a pretty 

 species with white flowers from Switzerland. It forms rather 

 flat tufts of dark green, almost shining smooth trifoliate leaves, 

 from the axils of which spring the simple leafless flower-stalks, 

 supporting a somewhat dense tmss of flowers, rather smaller 

 in size than those of the preceding. They are very pure white, 

 and appear in March and April. Height about 9 inches or i 

 foot, suitable for culture in drier soils than the preceding sort. 



Cheiranthus ( Wallflonier). — There is about an equal number 

 of hardy and half-hardy species comprised in this genus. The 

 latter must be passed over here with the remark, that most 

 of them may be cultivated in the neighbourhood of London, 

 and in the counties beyond it southward and westward, but 

 generally not farther north, except in the mildest seasons. The 

 best are C. midabilis from IMadeira, growing about 3 feet high, 

 and producing a profusion of pale-yellow and purple flowers in 

 April and May. C. imdahilis var. longifoliiis, commonly in 

 catalogues named C. longifolius, has longer and naiTOwer 

 leaves, and pale pinkish-purple flowers faintly tinged with white, 

 but in other respects is the same as the species. C. sempcrflorens, 

 from Barbar}^, grows about 2 feet high, with white flowers, 



