POPULUS GRANDIDENTATA, MICHX. 31 



Populus grandidentata, Michx. 



Poplar. Large-toothed Aspex. 



Habitat and Range. In rich or poor soils ; woods, hillsides, 

 borders of streams. 



Nova Scotia, New Brunswick, southern Quebec, and Ontario. 



New England, common, occasional at altitudes of 2000 

 feet or more. 



South to Pennsylvania and Delaware, along the mountains to 

 Kentucky, Xorth Carolina, and Tennessee ; west to Minnesota. 



Habit. A tree 30-45 feet in height and 1 foot to 20 inches 

 in diameter at the ground, sometimes attaining much greater 

 dimensions ; trunk erect, with an open, imsymmetrical, strag- 

 gling head ; branches distant, small and crooked ; branchlets 

 round ; spray sparse, consisting of short, stout, leafy shoots ; 

 in time and manner of blossoming, constant motion of foliage, 

 and general habit, closely resembling P. tremidoides. 



Bark. Bark of trunk on old trees dark grayish-brown or 

 blackish, irregularly furrowed, broad-ridged, the outer portions 

 separated into small, thickish scales ; trunk of young trees 

 soft greenish-gray ; branches greenish-gray, darker on the 

 underside ; branchlets dark greenish-gray, roughened with 

 leaf-scars ; season's twigs in fall dark reddish-brown, at first 

 tomentose, becoming smooth and shining. 



Winter Buds and Leaves. Buds J inch long, mostly divergent, 

 light chestnut, more or less pubescent, dusty-looking, ovate, 

 acute. Leaves 3-5 inches long, two-thirds as wide, densely 

 white-tomentose when opening, usually smooth on both sides 

 when mature, dark green above, lighter beneath, bright yellow 

 in autumn ; outline roundish-ovate, coarsely and irregularly 

 sinuate-toothed ; teeth acutish ; sinuses in shallow curves ; 

 apex acute ; base truncate or slightly heart-shaped ; leafstalks 

 long, strongly flattened at right angles to the plane of the 

 blade ; stipules thread-like, soon falling. 



Inflorescence. March to April. Sterile catkins 1-3 inches 

 long, fertile at first about the same length, but gradually 



