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Order 76.— POLYGONACEiE. (Buckwheat Family.) 



Polygonum, L. 



Pennsylvanicum, L. 

 Virginianum, L. 

 lapathifoliutn, L. 

 hydropiperoides, Michx. 

 aviculare, L. (Goose-grass.) 

 amphibium, L. 

 dumetorum, L. 

 Convolvulus, L. 

 sagittatum, L. 

 arifolium, L. 



Hydropiper, L. (Smart-weed.) 

 Persicaria, L. (Lady's Thumb.) 



RUMEX, L. 



obtusifolius, L. 



Acetosella, L. (Sheep Sorrel.) 

 Britannica, L. (Swamp Dock.) 

 Hydrolapathura, Huds. 

 crispus, Z. (Curled Dock.) 



Order 77.— LAURACEtE. (Laurel Family.) 



Sassafras, Nees. 



officinale, Nees. (Sassafras.) 

 Benzoin, Nees. 



odoriferum, Nees. (Spice Bush.) 



Order 78.— NYSSACEiE. 



Nyssa, L. 



multiflora, Wang. (Black Gum.) 



Order 79.— LORANTHACE^E. (Mistletoe Family.) 



Viscum, L. 



flavescens, Pursh. (Mistletoe.) 



Order 80.— ULMACE^. (Elm Family.) 



Ulmus, L. 



Americana, L. (White Elm.) 

 fulva, Michx. (Slippery Elm.) 



