THE KINDS 259 



Ancient Briton are common varieties of this group (Fig. 186). 

 Mersereau probably belongs to this group. Iceberg is one of the 

 albino varieties. 



Fig. 186. — The Rathburn blackberry is a standard old variety which is still quite popular. 



(2) The short-clustered blackberries are borne on smaller and 

 weaker plants, with greenish canes, less thorny than the preceding. 

 The clusters of berries are short and leafless. The berries are 



