26 ROCK AND WATER GARDENS 



drought the small fibres will wrap, themselves around 

 stones and rock fragments, finding abundant moisture in 

 the cool depths. In the granite regions of the higher 

 Alps the following Androsaces are found : — A. glacialis, 

 A. carnea, and A. Vitaliana, the two former rosy, the 

 latter yellow. Chalk loving kinds are A. chamaejasme, 

 pink ; A. helvetica, white ; A. pubescens, white with 

 yellow eye ; and A. villosa, pink. 



A group of dwarf Campanulas, comprising C. Allioni, 

 cenisia and excisa, will swell the list of miniature 

 plants. C. Allioni forms a close network of succulent 

 roots, the stemless blue flowers being raised on small 

 rosettes of leaves. It is found on granite soil. C. 

 cenisia (Mont Cenis Harebell) is another free rooting 

 kind, with blue flowers and bright leaf rosettes. These 

 Campanulas do well on perpendicular rock faces, 

 clothing the joints with exquisite flower and leaf 

 clusters. 



A tiny Saxifrage, S. caesia, almost like a silvery moss, 

 is another native of the high Alps. It requires a sandy 

 soil, and must not be allowed to suffer from dryness 

 during the summer. The Cobweb Houseleeks 

 (Sempervivum) demand full exposure to sun ; in flat 

 spaces among the small Alpines their quaint silver leaf 

 rosettes and pink flowers are very distinct. To 

 combine with these there are many other families of 

 plants, the Primulas and Gentians, Artemisia and 

 Achillea. 



