(233) 



Explanation of the Plates. 



Plate 25. 



1. Quercus submollis Rydb. 



2. " Utahensis (A.DC.) Rydb. 



3. " Vreelatidii Rydb. 



Plate 26. 



1. Quercus kptophylla Rydb. 



2. " Gutmisonii (Torr. ) Rydb. 



Plate 27. 



1. Quercus nitescens Rydb. 



2. " Novo-Mexicana (A.DC.) Rydb. 



Plate 2S. 



1. Quercus Gambelii Nutt. 



2. " Eastwoodiae Rydb. 



3. " venustula Greene. 



Plate 29. 



1. Quercus Fendleti Liebin. 



2. " Havardi Rydb. 



3. " obtusifolia (A.DC.) Rydb. — leaves. 



4. " " " " —fruit. 



Plate 30. 



1. Quercus breviloba (Torr.) Sargent. 



2. " pauciloba Rydb. 



3. " pungens Liebrn. 



4. " undulata Torr. 



5. " " Vaseyana (Buckl.) Rydb. — leaf. 



Plate 31. 

 Quercus Mohriana Buckley. 



" " " leaf of young sboot. 



" Arizonica Sargent. 



" " " leaf of young sboot. 



reticulata Humb. & Bonpl. 



(< 



Plate 32. 

 Quercus g rise a Liebtn. 

 " oblongifolia Torr. 

 " " " leaf of young shoot. 



" Emoryi Torr. 



" " leaf of the form described as Q. hastata Liebm. 



" Tounieyi Sargent. 



Plate 33- 



Quercus turbinclla Greene, usual form. 



" " " form with subentire leaves. 



" Wilcoxii Rydb. 



" " " leaf of young shoot. 



" hypolcuca Engelm. 



<< " " leaf of shoot. 



