EXPLANATION OF THE PLATES. 



Plate DCXVIIL Abies magnifica. 



1. A branch with stammate flowerSj natural size. 



2. An anther, side view, enlarged. 



3. An anther, front view, enlarged. 



4. A branch with pistillate flowers, natural size. 



4 



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



enlarged. 



6. A bract of a pistillate flower, lower side, enlarged. 



Plate DCXIX. Abies magnifica. 



1. A fruiting branch, natural size. 



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



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



4. A seed, natural size. 



5. Vertical section of a seed, enlarged. 



6. An embryo, enlarged. 



7. A leaf of a sterile branch divided transversely, enlarged. 



I 



8. A leaf from the upper side of a cone-bearing branch, natural size 



9. A leaf from the lower side o£ a cone-bearing branch, natural size. 



10. A leaf from a sterile branch of a young tree, natural size. 



11. End of a leading shoot, natural size. 



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



13. Seedling plants, natural size. 



Plate DCXX. Abies magnifica, var. Shastensis. 



1. A fruiting branch, natural size. 



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

 3- A cone-scale, upper side, with a seed, natural size. 



4. A seed, natural size. . 



