EXPLANATION OF THE PLATES. 



Plate DLV. Pinus resinosa. 



1. A branch with staminate flowers, natural size. 



2. A staminate flower, enlarged. 



3. Diagram of the involucre of the staminate flower. 



4. An anther, side view, enlarged. 



5. An anther, front view, enlarged. 



6. A branch with pistillate flowers, natural size. 



7. A pistillate flower, enlarged. 



8. A bract of a scale of a pistillate flower, lower side, enlarged. 



9. A scale of a pistillate flower, upper side, with its bract and ovules, enlarged. 



10. Tip of a leaf, enlarged. 



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



12. A cluster of winter branch-buds, natural size. 



Plate DLVI. Pinus resinosa. 



1. A fruiting branch, natural size. 



2. A cone-scale, lower side, natural size. 



3. A cone-scale, upper side, with its seeds, natural size. 



4. A seed, natural size. 



5. A seedling plant, natural size. 



