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Key to the Trees of Wisconsin
23. Branches of the
current year brown and covered with dense,
spreading hairs; lateral bud covered by the petiole base,
therefore not visible when the leaf is attached; sap milky;
wood yellow.
23. Branches of the
current year gray and glabrous or if a little hairy when young
the hairs not conspicuously spreading; lateral buds not covered
by the petioles, therefore easily visible; sap clear; wood
not yellow.