EXPLANATION OF THE PLATE. 



Plate DLXXXIII. Pinus glabra. 



1. A cluster of staminate flowers, natural size. 



2. Diagram of the involucre of the staminate flower. 



3. An involucre of a staminate flower, enlarged. 



4. An anther, side view, enlarged. 



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 fruiting branch, natural size. 



9. A cone-scale, lower side, with its bract, natural size. 



10. A seed, natural size. 



11. Vertical section of a seed, enlarged. 



12. An embryo, enlarged. 



13. Tip of a leaf, enlarged. 



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



15. Winter branch-buds, natural size. 



