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Key to the Trees of Wisconsin
80. Tree not conspicuously
spreading upward, maintaining one central trunk through most
of its height, lower branches curving downward; two-year older
branches often forming conspicuous corky ridges; fruit glabrous
over the face of the seed.
80. Tree spreading
upward, the trunk typically dividing quickly into 2 or more
major portions, lower branches clearly rising; two year and
older branches not forming conspicuous corky ridges; fruits
pubescent on the face of the seed.
