"ChrisV01" wrote ...
The area where I live (New England) has many wild grapes. I am told these
are
Concord grapes. However, I have noticed while most have the usual serated
pear-shaped or spear-shaped leaves, a few will grow leaves that become
three-pronged (trident) shaped. What is the difference between these two
types? Which is what? Are the trident leaves representative of a
different
species of grape or just some phase that Concord grapes go through?

I bought a Concord grape vine some years back (it was supposed to be
seedless, but wasn't). There are also wild grape vines nearby. I see both
types of leaves. My guess is that the 3-pronged ones are native and the
spearhead-shaped ones are hybridized, since that is the leaf shape that the
cultivated Concord vine has.