Explanation of Plate II. 



Mature One Year Wood. 



2. V. coriacea. 



-3. V. candicans. 



4. V. Doaniana. 



5. V . Champini. 



18. V . Calif ornica. 



19. V. Girdiana. 



20. V. Arizonica. 



21. V. Treleasei. 



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

 2.3. V . Longii. 



24. V . rupestris. 



