14 ENGELMANN-OAKS OF THE UNITED STATES. [385 
The leaves of .the glabrous form resemble those of Phellos and of the 
silky variety those of cinerea , and without the fruit they could not well be 
distinguished from some forms of them. 
H- Q coccitiea, Wang. I have, with some hesitation, fqllowed DeCan- 
dollb and Gray in uniting with this species ^, tivctorin^ Bart., which 
has broader, less lobed and firmer leaves,,and a deep yellow colored inner 
bark ; but I suspect that specific differences may yet be discovered. 
15. cinerea, Michx. In specimens from S. Carolina I find, together 
With the ordinary stellate pubescence, an abundance of yellow articulated 
hair on the young leaves, while in flowering Texan specimens it seems to 
be entirely wanting. 
16. laurifolia, Michx., appears after all to be distinct from aqua¬ 
tica ; whether entire or lobed, the leaves of the latter have a cuneate out¬ 
line widest in the upper third or at least above the middle; the calyx lobes 
are larger and very conspicuous, and the filaments enclosed and only the 
anthers exsert. ^ . laurifolia has lanceolate oblong leaves, widest about 
the middle whether entire or lobed'; the calyx lobes are much smaller; 
the filaments^ete^ exsert; this in flowering specimen^ of both species from 
Bluffton, the only ones which I could compare. A specimen from the 
gulf coast of Mississippi has oval entire coriaceous leaves 4 inches long 
and 1 h inches wide, while those of my South Carolina plants are narrower, 
and rather approach to Phellos , but never to aquatica. They usually per¬ 
sist until the budding time, but not beyond it; therefore I would not 
call them really evergreen. 
17. heterofhylla, Michx., must, I believe, like the foregoing, be re¬ 
adopted as a distinct Species, as it is neither a variety of aquatica or Phel¬ 
los, nor a hybrid of any of these oaks. As I have not yet seen flower or 
fruit, my opinion, which stands alone in opposition to the best recent 
botanists, must for the present be taken for what it may be worth. 
I distinguish Michaux’s species by its long and distinctly petioled leaves,, 
which in vernation are revolute, and are glabrous from their earliest age. 
My specimens, natives from New Jersey, cultivated ones from Bartram’s 
and Marshall’s gardens, and from the European gardens at Verriere. 
Herrnhausen and Prague, the latter fertile, agree in this respect among 
themselves and with Michaux’s figure in his Sylva. In all these specimens 
the leaves are lanceolate, entire, or sinuate-dentate, 3 or mostly 4-6 inches 
long, 1-2 inches wide, on a petiole 3-9 lines long. In the allied species, 
Phellos, laurifolia, and aquatica, the petioles are usually inconspicuous 
or merely 1-2 lines long; only imbricaria, which is also readily dis¬ 
tinguished by its pubescence, has plainly petioled leaves. I suspect that 
some specimens claimed for Phellos are entire leaved forms of the spe¬ 
cies in question. May these suggestions induce the local botanists of the 
lower Delaware region, the favorite home of this oak, to work up the 
species. 
18. Wislizeni, A. DC. With his usual acumen, A. DeCandolle dis¬ 
covered this species in a small fruiting specimen, brought by Dr. Wislize- 
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