265] FLORA OF COLUMBIA AND VICINITY 1 23 



109. OORYLUS Tourn. Hazel. Filbert. 



297. O. Americana Walt. Wild hazel-nut. 

 Thickets, especially on hillsides. 



Maine to Manitoba; Florida to Kansas 



110. BETULA Tourn. Birch. 



298. B. nigra L. River birch. 

 Frequent along streams. 



Massachusetts to Minnesota and Kansas; Florida to 

 Texas. 



111. ALNUS Tourn. Alder. 



299. A. serrulata Willd. [A. rugosa (Du Roi) Koch]. 

 Smooth alder. 



Along a strea.Ti in the University Farm. 

 Maine to Minnesota; Florida to Texas. 



Family 25. FAGACEAE Drude. Beech family. 



112. QUERCUS L. Oak. 



300. Q. imbricaria Michx. Shingle oak. 

 Common in the borders of woods and wild fields. 

 Pennsylvania to Michigan and Nebraska; Georgia to 



Arkansas. 



300 a. Q. imbricaria Michx. X Q. palustris Du Roi. 

 One small tree three miles northwest of Columbia. 

 Missouri. 



300 b. Q. imbricaria Michx X Q.tinctoria Willd. [X 

 Q. Leana Nutt.]. Lean's oak. 

 One tree five miles northeast of Columbia. 

 District of Columbia, Michigan, Ohio and Missouri. 



301. Q. Marylandica Muench. [g. w^a Wang.]. Black 



jack. 

 Sterile red clay hills and summits of cliffs; scarce. 

 Long Island to Nebraska; Florida to Texas. 



