PLATE V 



Physocarpus malvaceus (11a and lib) 



Vessels present; vessels decreasing gradually in size from 

 early to late wood; vessels smooth in outline, solitary or in 

 occasional pairs; vessel perforation plates simple; axial 

 parenchyma predominantly diffuse or absent; rays one or 

 two cells in width (rarely three). 



Primus emarginata (12a, 12b, and 12c*) 



Vessels present; vessels grouped in radial bands; rays 

 three to many cells in width, dispersed between uniseriate 

 rays . 



