SECTIAN FROM THE MISSISSIPPI RIVER TO POUND GAP, 57 
. Genus Corylus—hazelnut. 
Common hazelnut, Corylus Americana (Walt.) 
. Genus Ostrya—hop hornbeam. | 
Common ironwood, Ostrya Virginica ( Willd.) 
Var. hornbeam, Carpinus Americana (L.) 
(Nore.—I prefer giving the latter as a mere variety 
of the former, rather than as a distinct genus car- 
pins.) 
ORDER JUGLANDACE. 
. Genus Carya—hickory. 
Black hickory, Carya tomentosa (Nutt.) 
White hickory, Carya microcarpa (Nutt.) 
Shag hickory, Carya alba (Nutt.) 
Shellbark hickory, Carya sulcata (Nutt.) 
Pig hickory, Carya glabra (Torr.) 
. Genus Juglans—walnut. 
Black walnut, Juglans nigra (L.) 
White walnut, Juglans cinerea (L.) 
ORDER BETULACE. 
. Genus Betula—birch. 
Black birch, Betula lenta (L.) 
Red birch, Betula nigra (Ait.) 
Yellow birch, Betula excelsa (Ait.) 
Spotted birch, Betula pumila (L.) 
. Genus Alnus—alder. 
. Genus Acer 
Swamp alder, Alnus serrulata (Willd.) 
ORDER ACERACE&. 
maple. 
White maple, Acer dasycarpum (Ehr.) 
Black maple, Acer nigrum (Mx.) * 
Red maple, Acer rubrum (L.) 
Same, Var. tridens. 
Sugar maple, Acer saccharinum (L.) 
Mountain maple, Acer spicatum (Lam.) 
2. Genus Negundo. 
Box-elder, Negundo aceroides (Moench) 
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