102 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



is a rampant grower in any soil, but easily kept within bounds by timely 

 division of the root. The garden forms are dahurica (syn. speciosa), of 

 which there are three distinct varieties, alba, pallida, and azurea (syn. 

 aggregata). The deep rich bluish- violet colour of dahurica is most 



effective. It should be massed in the border near Crimson Pyrethrums, 

 Hemcrocallis flava and Inula glandulosa, which flower at the same time 

 in June ; jxdlida often continues to flower till late in the autumn ; alba 

 is much smaller, not much over one foot inl height ; azurea (syn. 

 aggregata) is also a compact-growing variety and a really scarce and 

 beautiful plant. 



