204 Rhodora [DECEMBER 
The illustration given by Michaux Jr. shows a leaf-blade as broad as 
long. In Maryland another type seems to prevail having an outline 
recalling the leaf of Betula nigra. Dr. E. L. Greene has collected 
specimens (f. 1) near Springfield, Nova Scotia, which show the first 
type. The corresponding root-shoot leaf (f. 2) differs from the 
ordinary root-shoot leaf by its attenuate apex (cf. ff. 2, 4). The 
leaves of the young growth of our Maryland form are well illustrated 
in figures 3 and 4, the latter figure representing a leaf with a blade 
20 cm. in length. 
Fig. 4. Fig. 5. 
Fig. 4. Populus grandidentata f. meridionalis. X }. 
Fig. 5. Populus grandidentata f. coelestina. X }. 
The type of leaf of the poplar found in Garrett County deviates 
much from that of the others. 
The leaves of this form are thinner: their outline commonly sub- 
rotund: the apex is not at all prominent, sometimes rounded so as to 
make the leaf outline elliptical: the margin is repand or remotely 
repand-dentate, and not prominently repand-dentate or serrate. 
'The forms may be distinguished thus: 
