No. 50.] 171 



Populus, (continued.) 



tremuloides, Michx. American Aspen . Dry woods . April . 



tremula, L. P. grandidenta, Michx. Large Aspen. Woods. 



laevigata, Ait. P. canadensis, Michx. f. Cotton-wood . Western 

 part of New-York. Michaux. 



nigra, Michx. P. hudsonica, Michx. sylv. P. betulifolia, Pursh. 

 Black Poplar . Banks of the Hudson above Al- 

 bany, Michx. fit. Borders of Oneida lake. 



Sub-Order Myrice^e. The Gale Tribe. 



Myrica, L. 



gale, L. Sweet Gale. Borders of lakes, generally in moun- 

 tainous tracts. May. 

 cerifera, L. Bayherry, Wax Myrtle. Woods and thickets. May. 



Comptonia, Banks. 



asplenifolia, Ait. Siveet Fern . Dry woods . April-May . 



Sub-Order PlatanEjE. The Plane Tribe, 



Platanus, L. Plane Tree. 



occidentalis, L. Button-wood, Sycamore. Banks of rivers. May. 



Sub-Order Styraciflue^e . 



Liquidambar, L. Sweet Gum Tree. 



styraciflua, L. Bilested. Woods. April. 



Order ULMACEiE. The Elm Tribe. 



Ulmus, L. Elm. 



americana, L. White Elm . Low woods . April-May . 

 fulva, Michx. U. rubra, Michx. f. sylv. Slippery Elm, Red Elm. 



Rocky banks of rivers . April . 

 racemosa, Thomas. Western counties, Mr. Thomas, Dr. Kneis- 



kern. 



Celtis, L. Hackberry . 



occidentalis, L. Hoop Ash, Beaver-wood . Woods. May. 



