1911] Tidestrom,— Populus virginiana Fouger. 197 
comes a larger tree with spreading branches. (The same statement 
might be made with respect to other species of Populus, except Popu- 
lus nigra italica and P. alba Bolleana which are naturally fastigiate 
forms.) I have only seen staminate trees of P. deltoides in our region. 
The aments are well illustrated in Professor Sargent’s magnificent 
work.! The anthers are described as being red, which statement 
agrees with my observations. In or about Washington the trees 
flowered this year about April 7, two weeks later than in ordinary 
seasons. 
The other “subspecies” of. Ascherson and Graebner’s treatment, 
is apparently native of this 
region. Its entire range is un- 
known at present. Typical 
leaves of this species are illus- 
trated by Schneider under P. 
monilifera, from which it may 
not differ in any particular except 
possibly in varietal characters. 
It was only upon the authority 
of the early botanists that I ven- 
tured ? to identify our native tree 
with P. virginiana Fougeroux. 
If any species is entitled to this 
name it is certainly this one, 
which is the only apparently 
native black poplar of Virginia. 
It is readily recognized by its 
leaves. These are almost always 
somewhat cordate. (See the text ; vr 
j Fig 1. Populus virginiana. Leaf x }, 
figure.) Not only in the form of showing characteristic form of base. 
the leaves do the two species 
differ. Their flowering seasons are about two weeks apart in our 
region. Another feature is that the anthers in P. virginiana are yel- 
low, while in P. deltoides, as stated above, they are red. 
Populus virginiana flowered this year about April 20, just thirteen 
days after P. deltoides, and it was indeed a pleasant sight to see the 
golden aments. The trees from which I collected my specimens 
1 Silva of N. Am. 9: 179. 
? Elysium Marianum 3: 16, t. 3, f. B, 1910, 
