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Key to the Trees of Wisconsin
101. Bark of trunks and larger
branches splitting into close vertical, shaggy strips and
lacking conspicuous lenticels; bud scales often striate along
their length (requires handlens).
101. Bark of trunks and larger
branches papery and peeling into irregular sheets or deeply
furrowed, but retaining some evidence of papery layers; lenticels
usually conspicuously elongate horizontally; bud scales not
striate. Betula
