PLATE III. 



Page. 



Figs. 1,2. Populus elliptioa Newb 43 



3,4. Populus cyclophylla Heer _ _ 41 



5. Populus ruicrophj'lla Newb - . 40 



6. Populus litigiosa Heer - 45 



7. Populus (?) cordifolia Newb __: __ 40 



8. Phyllites VanoiiEe Heer - - 136 



160 



