Cornaceæ. 



147 



papillae, subsequently matures. Though self-fertiHzation is 

 prevented by proterandry there may occasionally be ob- 

 served, resting against the stigma, the anthers of neighbouring 

 flowers. The honey is secreted in a very thin layer by a 

 dark brown ring at the base of the style К 



Fig. 11. Cornus canadensis. 



A, Transverse section of leaf (Inuarudgligak, Greenland), B, Epidermis, upper surface 



(Greenland); C, Transverse section of leaf (Minnesota); D, Epidermis, upper surface 



(Minnesota) ; A, B, С and D, about "^/i. 



Thomas Meehan reports having observed, that C. canadensis is 

 partly monoecious, partly dioecious. He has only seen plants 

 with ripe fruit, not any flowering specimens, and found, that 

 the inflorescences of some plants v^^ere quite sterile, others had a 

 single berry in the middle of the cyme, while others again 

 were rich in fruits; from this he draws his conclusion. All 

 the individuals I have examined have been hermaphrodite, and 

 as Lowell, who has studied the biology of the flower, does not 



10* 



