OF ARTS AND SCIENCES. 19 



Populus alba L. A persistent escape 



tremuloides Michx. Common 



graiiditlentata Michx. Common 



balsamifera L. Plymouth. ( W. H. Huse) Rare ? 

 candicans Ait. Common 



iiigra L., var. italica Du Roi. A persistent escape 



Myricacese 



Myrica Gale L. Common 

 caroliiiensis Mill. Rare 



aspleiiifolia L,. Common 



Juglaiidaceae 



Juglans cinerea L. Common 



Carya ovata (Mill.) K.Koch. Common 



glabra (Mill.) Spach. Common 



Betulaceae 



Corylus americana Walt. Common 



rostrata Ait. Less common 



Ostrya virginiaiia (Mill.) K. Koch. Common 



Carpinus caroliiiiaiia Walt. Common 



Betula leiita Iy. Common 



lutea Michx. f. Common 



nigra L. Abundant in Pelham along Beaver Brook, 

 and extending not less than four miles north of the 

 Massachusetts line. 



populifolia Marsh. Common 



alba L., var. papyrif era (Marsh.) Spach. Common 



Aliius incaiia (L,.) Moench. Common 



rvigosa (Du Roi) Spreng. Common 



