No. 50.] 
171 
PoPULUs, (continued.) 
tremuloides, Michx. American Aspen . Dry woods . April . 
tremula, X. F. gmndidentdi, Michx. Large Aspen. Woods. 
lagvigata, 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. Jil. 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. 
asplenifoHa, Ait. Sweet Fern . Dry woods . April-May . 
Sub-Order Platane^. The Plane Tribe. 
Platanus, L. Plane Tree. 
occidentalis, L. Button-ioood, Sycamore. Banks of rivers. May. 
Sub-Order STYRAciFLUEiE . 
LiQuiDAMBAR, L. Swcct Gum Tree. 
styracifiua, L. Bilested . Woods . April . 
Order ULMACE^E. The Elm Tribe. 
Ulmus, L. Elm. 
americana, jL. 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 » 
