46 



8ILVA OF WORTH AMERICA. 



CONIFERS. 



brilliant in color, and graceful spire-like crowns of soft foliage of tenderest hue, keeps green on a 

 thousand mountain-tops the memory of a good and wise man/ 



1 See viii. 84. 



EXPLANATION OF THE PLATE. 



- / 



Plate DXCIX. Pice a Engelmanni. 



1. A branch with staininate flowerSj natural size. 



2. An anther, front view, enlarged. 



3. A branch with pistillate flowers, natural size. 



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



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



6. A fruiting branch, natural size. 



7. A cone from Mount Hood, Oregon, natural size. 



8. A cone from the San Francisco Peaks, Arizona, natural size. 



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



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



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



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



13. A seed, enlarged. 



14. An embryo, enlarged. 



15. Cross section of a leaf magnified fifteen diameters. 



16. Winter branch-buds, natural size. 



17. A seedling plant, natural size. 



