178 REPORT OF AN EXPEDITION DOWN THE ZUNI, ETC. 

 Plate 17. Quercus oxYADENiA 

 A branch of the natural size. 



Plate 18. Quercus Gambelii. 

 A branch of the natural size. 



Plate 19. Quercus oblongifolia. 

 A branch of the natural size. 



Plate 20. Pixus edulis. 

 Fig. 1, a pair of leaves ; fig. 2, a seed — both of the natural size. 



