Explanation of Plate II. 



Mature One Year Wood. 



2. 1 . coriacea. 



>. r. candicans. 



4. V. Doaniana. 



5. V. Champini. 



IS. V. Californica. 



19. V. Girdiana. 



20. V. Arizonica. 



21. V. Treleasei. 



22. V. vidpina. (V . riparia.) 



23. V r . Longii. 



24. V. rupestris. 



16 



