1914] Tidestrom,— Flora of, Maryland and Virginia,— II 203 
to. Willdenow which he called P. trepida. The latter published it 
under that name in 1806.' His description is applicable to P. grandi- 
dentata and to no other. Moreover, Muhlenberg? later on refers P. 
grandidentata to P. trepida. This was discussed by the writer in the 
American Midland Naturalist 2: 13. 1911. 
On July 5, while I was botanizing between Oakland and Thayer- 
ville, Garrett Co., Maryland, another, poplar came to my notice. 
Fig. 3. 
. Fig. 1. Populus grandidentata f. septentrionalis. X 4. 
Fig. 2. Populus grandidentata f. septentrionalis. X }. 
Fig. 3. Populus grandidentata f. meridionalis. X 4. 
It resembled much P. tremula at a distance but proved to be a form of 
P. grandidentata. I was convinced at the time that the latter species 
has a wide range of variation in the form and size of its leaves. There 
appear to be three distinct forms of normal leaves — two of which 
may sometimes occur on the same tree, if not on the same branch. 
1 Willd. Sp. Pl. 4: 803, 1806. 
2 Muhl. Catalogue 92, 1813. 
