290 



TREES OF MINNESOTA. 



I'iate 32. Qucrcus alba. White Oak. 



i. Flowering branch, one-half natural size. z. Portion of a staminate 

 catkin, enlarged. 3. Staminate flower, enlarged. 4. Cluster of pistillate 

 (lowers, enlarged. 5. Cross section of ovary, enlarged. 6. Fruiting branch, 

 one-half natural size. 7. Cup, one-half natural size. 8. Longitudinal sec- 

 tion oi acorn, one-half natural size. 9. A germinated acorn, one-half natur- 

 al size. 



