SPERMATOPHYTA. 39 



Quercus (Tourn.) L. Oak. 



alba L. White Oak. Common. 



bicolor Willd. Swamp White Oak. 



In rich woods, not rare. 



prinoides Willd. In dry soil. 



Prinus L. Chestnut Oak. In dry soil, common, 



rubra L. Red Oak. Common, 



palustris Muench. Pin Oak. 



In the southern part of the county, 

 coccinea Muench. Scarlet Oak. Common, 



velutina Lam. Black Oak. Common, 



ilicifolia Wang. Scrub Oak. Common, in sandy soil. 



URTICACE^E (NETTLE FAMILY). 



Ulmus (Tourn.) L. . Elm. 



fulva Michx. Slippery Elm. In rich woods, not rare. 



americana L. American Elm. 



In rich woods, common. 

 Celtis (Tourn.) L. Hackberry. 



occidentalis L. Sugarberry. Rare. 



Cannabis (Tourn.) L. Hemp. 



sativa L. In waste places, Worcester. 



Humulus L. Hop. 



Lupulus L. Common Hop. 



In thickets and along river-banks. 

 Moms (Tourn.) L. Mulberry. 



alba L. White Mulberry. 



Sparingly escaped from cultivation, Millbury. 

 Urtica (Tourn.) L. Nettle. 



gracilis Ait. In waste places, common. 



dioica L. Stinging Nettle. In waste places. 



