having smooth
bark and five leaflets per leaf. The leaves are finer and smaller than
on the seven leaflet trees.

These may be the _glabra_ species, but if so, grafting results have been
no better on these than on the seven leaflet trees.

As nursery stock the pignuts are worthless. However if one has some nice
young pignut trees growing where he wants them, it is feasible to graft
them to Davis or some other variety which has proven its ability to grow
on pignut stocks. It is not advisable to graft hickory trees growing in
dense woods.

MOCKERNUT, _Carya alba_

While the mockernut is also a tetraploid, it is a somewhat better stock
than the pignuts, in that more of the named varieties will grow on it
and as the mockernut is faster growing than the pignut, such grafts will
usually grow faster.

It is of little value as a nursery stock, but if one has young mockernut
trees growing where hickory trees are wanted, they would be somewhat
better to graft than would pignut trees. One would at least have a
larger selection of varieties and the grafts would grow faster.

PECAN, _Carya illinoiensis_

While we have read many favorable reports on the use of the pecan as a
stock on which to graft shagbark, shellbark and hybrid hickories, our
own experiences with it have not been very favorable. This may be due to
the fact that we have used only two varieties of shagbark on
pecan-stocks and may have happened to use two varieties that are not
well adapted to pecan.

Pecan seedlings are much faster growing than are shagbark seedlings and
for this reason would be valuable as a nursery stock if satisfactory in
other respects.

BITTERNUT, _Carya cordiformis_

All of our experiences with bitternut as a stock, both in the nursery
and as young trees growing in permanent locations, have been very
favorable.

We have heard reports of grafts failing on bitternut stocks after a few
years growth. All such reports have come from regions considerably
farther south than our location. It may be that the bitternut does not
thrive as well in the South as it does here.

Bitternut seedlings are much faster growing than are shagbark seedlings.
This is of considerable value in the nursery.

SHAGBARK, _Carya ovata_

The shagbark makes the best stock on which to graft the named varieties
of shagbark, shellbark and hybrid hickories. However it has one very
serious drawback in that young shagbark seedlings are so very slow
growing