ROCK AND ALPINE PLANTS 141 



flower by the pond side in Regent's 

 Park. ASTER ALPINUS has also survived and 

 flowered freely for a number of years where 

 constantly subjected to smoke, dust, and 

 other impurities which are connected with a 

 town atmosphere. Calceolaria Polyrhiza has 

 become quite established and increases 

 rapidly in the town garden, the single deep 

 yellow flowers being freely produced. Two 

 species of WILLOW also thrive, these 

 including the choice little Salix reticulata, 

 with its beautifully reticulated leaves and neat 

 procumbent habit of growth, and the equally 

 choice and dwarf S. herbacea. Neither has 

 received any particular care as to choice of 

 soil or site. ARABIS ALBIDA and its double 

 flowering variety are both useful plants for 

 the rock garden, where they increase and 

 flower freely. STATICE SPATHULATA and the 

 neat dwarf 5. speciosa have both thriven well 

 in a town garden for the past ten years. They 

 are interesting evergreens, with pretty lilac, 

 almost everlasting flowers, and seem to suc- 

 ceed best when planted in gritty loam and 



