EXPLANATION OF THE PLATE. 



Plate DLXXXI. Pinus Virginiana. 



1. A flowering branch with staminate flowers, natural size. 



2. A staminate flower, enlarged. 



3. An anther, enlarged. 



4. Diagram of the involucre of the staminate flower. 



5. An end of a branch with pistillate flowers, natural size. 



6. A pistillate flower, enlarged. 



7. A scale of a pistillate flower, lower side, with its bract, enlarged. 



8. A scale of a pistillate flower, upper side, with its ovules, enlarged. 



9. A fruiting branch, natural size. 



10. A cone-scale, lower side, with its bract, enlarged. 



11. A seed, enlarged. 



12. Vertical section of a seed, enlarged. 



13. An embryo, enlarged. 



14. Tip of a leaf, enlarged. 



15. Cross section of a leaf, magnified fifteen diameters. 



16. Expanding branch-buds, natural size. 



17. A seedling plant, natural size. 



