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TREES OF MINNESOTA. 



Plate 57. Rhamnus catharticus. Buckthorn. 



i. Flowering branch from staminate plant, one-half natural size. 2. 

 Flowering branch from pistillate plant, one-half natural size. 3. Staminate 

 flower, enlarged. 4. Longitudinal section of staminate flower, enlarged. 

 5. Pistillate flower, enlarged. 6. Longitudinal section of pistillate flower, 

 enlarged. 7. Cross section of ovary. 8. Single fruit, one-half natural size. 

 9. Single fruit with a part removed to show nutlets. 10. Cross section of 

 seed. ii. Embryo. 12. View of grounds showing the use of Buckthorn 

 for a hedge. 



