30 FLORA OF BURLINGTON AND VICINITY 



P. CANDiCANs Ait. Balm of Gilead. Occasional in cultivation and 

 sometimes spontaneous. Apr., May. 



r. deltoides Marsh. Cotton-wood, Necklace Poplar. Borders of streams 

 and of Lake Champlain; frequent. Apr., May. 



P. grandideiitata Michx. Large-toothed Aspen. Rich woods; frequent. 

 Apr., May. 



P. NIGRA L. One form occurs. Var. italica Du Roi. Lombardy Pop- 

 lar. Frequently cultivated and tends to spread by sprouting from 

 the roots. Apr., May. Only staminate trees occur. 



P. trenmloides Michx. American Aspen, Trembling Poplar. Woods; 

 common. Apr., May. 



SALIX (Tourn.) L. Willow. Osier 



S. alba L. One form occurs. Var. vitellina (L.) Koch. White Wil- 

 low. Common in cultivation and occasional as an escape. Apr., 

 May. 



S. cordata Muhl. Heart-leaved Willow. Wet soil; common. Apr., 



May. 



S. discolor Muhl. Pussy or Glaucous Willow. Wet soil; common. 

 Apr., May. Var. eriocephala (Michx.) Anders. South Burlington, 

 (Kirk and Jones). Apr., May. 



S. fragilis L. Crack Willow. Common in cultivation and as an es- 

 cape. May. 



S. huinilis Marsh. Prairie Willow. Dry sandy plains; common. Apr., 

 May. 



S. loiigifolia Muhl. Sand-bar Willow. Shores of Lake Champlain; 

 occasional. May. 



S. lucida Muhl. Shining Willow. Moist banks; frequent. May. 



S. nigra Marsh. Black Willow. Banks of streams and ponds; com- 

 mon. May. Var. falcata (Pursh) Torr. Burlington, (Rand). 

 May. 



S. pedicellaris Pursh. Bog Willow. Peat bogs; frequent. May. 



S. petiolaris Sm. Slender Willow. Swamps and shores of Lake Cham- 

 plain; rare. May. Burlington, (Grout and Jones). 



S. PURPUREA L. Purple Willow. A frequent escape to watersides. 

 Apr., May. 



