ROSACES. 



FIG. 106. Vertical section of Flower of Blackberry. 



The deviations from this type are so important that 

 some botanists divide the Order into four distinct Orders. 

 These it is now usual to regard as Tribes of one Order. 

 The four Tribes are : 



Rosece. Blackberry (Rubus) as type. 



Drupacece. Cherry (Prunus) as type, with a solitary 

 carpel. 



Pomacea. Apple (Pyrtts) as type, with the "calyx- 

 tube " adnate to the ovary. 



Sanguisorbece, Burnet (Sanguisorba officinalis) as type, 

 with monochlamydeous, sometimes unisexual, flowers ; the 

 calyx-tube investing the achene, but not adherent to it. 



