48 



FLORA OF WORCESTER COUNTY. 



sericea, Marsh. Silky Willow, 

 cordata, Muhl. Heart-leaved Willow. 



Common. 

 Worcester. 

 Prof. Eaton. 

 Leicester. 



myrtilloides, L. 

 PoPULUS, Tourn. Poplar. 



tremuloides, Michx. American Aspen. Common, 



grandidentata, Michx. Large-toothed Aspen. " 



balsamifera, L., var. candicans, Gray. Balm of Gilead. 



Spontaneous. 

 monilifera, Ait. Cotton-wood. Rare. 



CERATOPHYLLACE^. 



Ceratophyllum, L. 

 demersum, L. 



Hornwort. 



Slow streams. 



" var. echinatum, Gray. 



G. E. Stone. 



Subclass IL GYMNOSPERMtE. 

 CONIFERS. 



PiNUS, Tourn. Pine. 



Strobus, L. White Pine. Common. 



rigida, Mill. Pitch " 



resinosa, Ait. Red " Templeton. F. P. Parkhurst. 

 PiCEA, Link. Spruce. 



nigra, Link. Black Spruce. Not rare. 



TsuGA, Carriere. Hemlock. 



Canadensis, Carr. 

 Abies, Link. Fir. 



balsamea, Miller, Balsam Fir. 

 county. 



Quite common. 

 Northern part of the 



