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Key to the Trees of Wisconsin
57. Acorn cup less
deeply cup shaped ("turbinate to hemispheric") and
tending to be larger, though there is considerable overlap
in measurements; scales of the acorn cup broad and glossy
at the base and strongly narrowed above; there is often a
ring of "pits" at the tip of the acorn; distribution
limited to a very few locations in the southern three tiers
of counties in Wisconsin.
57. Acorn cup more deeply cup
shaped ("cup-shaped to turbinate") and tending to
be smaller; scales of the acorn cup not glossy at the base
and not narrowed upward or only slightly so; there is usually
no ring of "pits" near the tip of the acorn; widely
(though not uniformly) distributed throughout Wisconsin.
