C 38 ] 
BARTKAM OAK, 
Q,uercus heterophylla. Q. foliis longé petiolatis, ovato-lanceolatis, mtegris 
vel inæqualiter dentatis ; glande subglobosâ. 
Every botanist who has visited different regions of the globe must have 
remarked certain species of vegetables which are so little multiplied that 
they seem likely at no distant period to disappear from the earth. To 
this class belongs the Bartram Oak. Several English and American 
naturalists who, like my father and myself, have spent years in exploring 
the United States, and who have obligingly communicated to us the result 
of their observations, have, like us, found no traces of this species except 
a single stock in a field belonging Mr. Bartram, on the banks of the Schuyl- 
kill, 4 miles from Philadelphia. This is a flourishing tree, 30 feet in height 
and 8 inches in diameter, and seems formed to attain a much greater 
development. Its leaves are of an elongated oval form, coarsely and irre- 
gularly toothed, smooth above, and beneath of a dark green. The acorns 
are round, of a middle size, and contained in shallow cups lightly covered 
with scales. 
I was at first disposed to consider this tree as a variety of the Laurel 
Oak, to which it bears the greatest affinity ; but the leaves of that vspecies 
are never indented, and not a stock of it exists within a hundred miles of 
Philadelphia. 
Several young plants, which I received from Mr. Bartram himself, have 
been placed in our public gardens to insure the preservation of the 
species. 
PLATE XVIII.^ 
A branch with leaves and fruit of the natural size. 
[See NuttalPs Supplement, vol. I. p. 15, by which it appears that this 
tree has been discovered near Cincinnati, Ohio.] 
* [Erroneously referred to in Nuttall as plate 16,] 
