1914]  Tidestrom,— Flora of Maryland and Virginia,— II 205 
1. PoPULUS GRANDIDENTATA (ff. 1—5). 
a. septentrional’s (ff. 1, 2): folia ramorum rotundata pauce 
repande grandidentata, apice triangulare; surculorum cor- 
data inaequaliter serrata, acuminata, subtus plus minusve 
tomentosa vel canescentia. 
Canada and New England. 
8. meridionalis (ff. 3-4): folia ramorum elliptica (forma fol. 
Betulae nigrae) repande grandidentata, apice triangulare; 
surculorum cordata inaequaliter serrata, apice triangulare, 
repande grandidentata, subtus plus minusve tomentosa 
vel glabrescentia. 
New England and southward. 
y. coelestina (f. 5): folia ramorum rotundata vel elliptica, apice 
triangulari obtuso vel rotundato, margine repando. 
Mountains of Maryland. [Tm. 6449.] 
POPULUS HETEROPHYLLA. This species is said to be rare. I have 
observed it eight miles northeast of Pocomoke City, Worcester Co., 
Maryland, where it grows much scattered among other deciduous 
trees and Chamaecyparis thyoides. The tree is usually tall and straight, 
the branches and leaves being sometimes inaccessible. My specimens 
(Tm. 5435] were gathered from root-shoots. Mr. H. H. Bartlett has 
collected it at Sandy Landing, on the Potomac River some 17 miles 
west of Washington. 
PoPULUS TREMULOIDES. This species has been listed for Maryland.! 
It is not, however, recorded from the region immediately south of 
Pennsylvania in any of our recent manuals.” 
No specimens from Maryland have ever come to my notice, nor 
have I ever seen any trees in places where I might suspect its presence. 
Supposed specimens from "Thayerville, Garrett County, Md., are not 
of this species. On my recent visit to the latter place as stated 
above, I found no trace of Populus tremuloides, but in its stead P. 
grandidentata f. coelestina, which latter has a deceiving “ P. tremula 
aspect" from a distance. It should be remembered that Western 
Maryland is a little explored region botanically and that there are 
hundreds of square kilometers of forest area as yet unexplored. "That 
we might find it there is not at all unlikely, since other trees and shrubs 
with which it is usually associated are present in Garrett County. I 
have observed Populus tremuloides on Pocono Plateau, Pa., [Tm. 
! Plant Life of Maryland, p. 423. 
? Sargent, Man. of Trees of N. Am. p. 155, 1905. 
Gray's Manual, p. 328, 1908. 
Britton & Brown, Ill. Fl. 1: 590, 1913. 
