256 DAVENPORT ACADEMY OF SCIENCES. 



738. C. amara, Nutt. Bitter Nut or Swamp H. 



Frequent in low grounds and not rare in hilly woodlands. 



739. C. olivozformis x toinentosa. 

 Big timber near Muscatine. 



740. C. olivceformis x amara. 

 Big timber near Muscatine. 



CUPULIFERyE. 



Betula, Tourn. 



741. B. lutea, Michx. f. Yellow or Gray Birch. 

 Along rivers ; common. 



Corylus, Tourn. 



742. C. Americana, Walt. Wild Hazelnut. 

 Thickets and open woods ; common. 



Ostrya, Micheli. 



743. O. Virginica, Willd. American Hop-Hornbeam. 

 Woods ; frequent. 



Carpinus, L. Hornbeam. Ironwood. 



744. C. Caroliniana, Walter. Blue or Water Beech. 

 Along creeks; infrequent. 



Quercus, L. Oak. 



745. Q.a/ba,~L. White Oak. 

 Common. 



746. Q. macrocarpa, Michx. Burr Oak. 

 Common. 



747. Q. bicolor, Willd. Swamp White Oak. 

 Along rivers ; frequent. 



748. Q. Muhlenbergii, Engelm. Chestnut Oak. 



Bluff woodlands below Muscatine. Several trees on hillside 

 by railroad cut near N. W. Davenport (Radenhausen). 



749. Q. rubra, L. Red Oak. 

 Common. 



750. Q. coccinea, Wang., var. tinctoria, Gray. Yellow-barked Oak. 

 Frequent. 



751. Q. ellipsoidalis, E. J. Hill. 



One tree near Big Rock. See description at end of list. 



