Classification of the Oaks. ^13 



Second Section : Leaves lobed. 



18. Bar tram oak, Q. hettrophylla. 20. Black-jack oak, Q.ferrttffinea. 



19. Water oak, Q. aquatica. 21. Bear oak, Q. Banni*t> ri. 



Third Section: Leaves multifid or many-cleft. 



22. Barren scrub oak, (J. Catr.t- 2,'). Scarlet oak, Q. coccinea. 



baei. 26. (Jray oak, (J. (iinlntjita. 



23. Spanish oak, Q.falcata. 27. Pin oak, (}. p<tlu*tri->. 



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



853. The oaks have 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. 



(JIHTCII* alha, White oak. 

 " lobata, California white oak. 

 " Breicerii, Brewer's oak. 

 " Garrayana, Oregon white oak. 

 " stellata, Post oak. 

 " macrocarpa, Burr oak ; overcup oak. 

 " lyrata, Southern overcup oak. 

 " blcolor (Mic]i'tn.r!i i, Swamp white oak. 

 " jirlnii*, Kock-chestnut oak. 

 " Muhlenbergii (jiriiiuid,.^. Small chestnut oak. 

 " Doit(jlu*ii, California white oak. 

 " nndulata, Rocky Mountain white oak. 



pnngem, Arizona white oak. 

 (6.) Leaves persistent. 



Qitercus oblotujifolia, Oblong-leaved oak. 

 " dumosa, Dwarf California oak. 

 " reticulata. 



, Live oak. 



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

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

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

 to more than one species. 



