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?

Thank You