This is the only black walnut that has come to the author's
attention where its pollen acting on its pistillate bloom has affected
the production of nuts in just this way but the variety of black walnut
known as the Ohio, one of the best sorts for this northern climate
except for hardiness, has often demonstrated that it has a peculiarity
which might be caused by lack of outside pollen or because of the action
of its own pollen on its pistillate bloom. This peculiarity is the often
found one-sided development of the Ohio walnut kernel when the tree is
isolated from other pollen bearing black walnuts. One lobe of the kernel
is therefore full-meated while the other half or lobe is very
undernourished or it may be a thin wisp of a kernel as is the appearance
of the Weschcke variety in similar circumstances.
[Illustration: _Stabler variety of Black Walnut grafted on a Minnesota
seedling stock bore many years but was winter killed. Photo by C.
Weschcke_]
Cutting scionwood early one spring, I noticed that the sap was running
very fast in the grafted Stabler tree previously referred to. Later when
I came back to inspect this tree, I noticed that the sap had congealed
to syrupy blobs at the ends of the cut branches.
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