PLATE XXIV 



Ceanothus sanguineus (45a and 45b) and 



Ceanothus velutinus (46a and 46b) 



Vessels present; vessels solitary, in pairs, or in various 

 aggregates; vessels grade into smaller sizes as the growing 

 season progresses without an abrupt change in size; vessels 

 occurring in patterns of radially alined S curves in mature 

 wood; perforation plates simple; axial parenchyma predomi- 

 nantly diffuse; rays one or two cells in width (rarely three); 

 tannins occurring in even the young ray cells . 



