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TREES OF MINNESOTA. 



Plate 4. Pinus ponderosa scopulorum. Rock Pine. 



i. End of branch bearing staminate flower, enlarged. 2. End of branch 

 bearing pistillate flower, enlarged. 3. Anther, open. 4. Scale of pistillate 

 flower attached to bract, front view, enlarged. 5. Scale of pistillate flower 

 attached to bract, rear view, enlarged. 6. Cone, one-half natural size. 

 7. Scale of cone, rear view, one-half natural size. 8. Seed attached to wing. 

 9. Branch showing young growth, one-half natural size. 10. Fascicle of 

 three needles, one-half natural size. n. Fascicle of two needles, one-half 

 natural size. 12. Cross section of needle from three-leaf fascicle. 13. Seed- 

 ling, one-half natural size. 



