18 REPORT ON THE TIMBERS OF GRAYSON, 
2. Genus Alnus. 
Smooth alder, Alnus serrulata (Willd.) 
ORDER JUGLANDACEZ—WALNUT. 
1. Genus Juglans. 
White walnut, Juglans cinerea (L.) 
Black walnut, J. nigra (L.) 
2. Genus Carya. 
~ Shagbark hickory, Carya alba (Nutt.) 
Shellbark hickory, C. sulcata (Nutt.) 
Mockernut, C. tomentosa (Nutt.) 
Pignut hickory, C. glabra (Sorr.) 
White hickory, C. microcarpa (Nutt.) 
ORDER PLATANACE—SYCAMORE. 
Genus Platanus. 
Sycamore, plane tree, Platanus occidentalis (L.) 
ORDER OLEACEA—OLIVES. 
Genus Fraxinus. 
White ash, Fraxinus americana (L.) 
Blue ash, F. quadrangulata (Mx.) 
Black ash, F. sambucifolia (Lam.) 
ORDER ULMACEA—ELMWORTS. 
1. Genus Ulmus. 
Slippery elm (Red elm), Ulmus fulva (L). 
White elm, U. americana (L). 
Cork elm, U. racemosa (L.) 
Winged elm (Whahoo), U. alata (Mx.) 
2. Genus Celtis. 
Hackberry, Celtis occidentalis (L.) 
ORDER CORNACEAI—CORNELS. 
I 
I 
1. Genus Cornus. 
Flowering dogwood, Cornus florida (L.) 
Low cornel, C. canadensis (L.) 
2. Genus Nyssa. 
Black gum, Nyssa multiflora (Wang.) 
Swamp black gum, N. uniflora (Walt.) 
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