PLATE XXVI 



Lonicera involucrata (49a and 49b) 



Vessels present; vessels angular in outline; vessels solitary, 

 in pairs, or in various aggregates; vessels grade into smaller 

 sizes as the growing season progresses without an abrupt 

 change in size; vessel perforation plates simple; axial paren- 

 chyma present though sparse and diffuse; rays one or two cells 

 in width (rarely three), ray cells radially elongated in cross 

 sections . 



Lonicera utahensis (50a, 50b, and 50c*) 



Vessels present; vessels angular in outline; vessels solitary, 

 in pairs, or in various aggregates; vessels grade into smaller 

 sizes as the growing season progresses without an abrupt 

 change in size; vessel perforation plates simple; axial paren- 

 chyma present though sparse and diffuse; rays one or two cells 

 in width (rarely three); ray cells squared in outline in cross 

 sections . 



