Classification of the Oaks. 213 



Second Section : Leaves lobed. 



18. Bar tram oak, Q. heterophylla. 20. Black-jack oak, Q.ferruginea. 



19. Water oak, Q. aquatica. 21. Bear oak, Q. Bannister L 



Third Section: Leaves multifid or many-cleft. 



22. Barren scrub oak, Q. Gates- 25. Scarlet oak, Q. cocdnea. 



baei. 26. Gray oak, Q. ambigua. 



23. Spanish oak, Q.falcata. 27. Pin oak, Q. palustris. 



24. Black oak, Q. tinctoria. 28. Eed oak, Q. rubra. 



853. The oaks ha\e been made a subject of careful study by Dr. 

 Geo. Engelmann, of St. Louis, who arranges the native American 

 species according to their natural affinities, as follows : * 



A. LEUCOBALANUS (White Oaks.) 

 1. Seeds maturing annually: 

 (a.) Leaves deciduous. 



Quercus alba, White oak. 



" lobata, California white oak. 



" Brewerii, Brewer's oak. 



" Garrayana, Oregon white oak. 



" . stellate, Post oak. 



" macrocarpa, Burr oak ; overcup oak. 



" lyrata, Southern overcup oak. 



" bicolor (Mickauxii), Swamp white oak. 



" prinus, Rock-chestnut cak. 



Muhlenberyu (jprinoufes) . Small chestnut oak. 

 " Douglasii, California white cak. 

 " undulata, Rocky Mountain white oak. 

 u pungens, Arizona white oak. 

 (6.) Leaves persistent. , 



Quercus oblongifolia, Oblong-leaved oak. 

 " dumosa, Dwarf California oak. 

 '* reticulate. 



virena, Live oak. 



^Transactions of St. Louis Academy of Sciences, Vol. III., No. 4, p. 388. 

 The common names that we have added, are somewhat uncertain 4n their 

 use. It will be seen that some have two, some more, and others are applied 

 to more than one species. 



