BETULACEAE: Birch Family

KEY TO SPECIES OF ALNUS

1. Mature vegetative buds sessile or with a stalk less than 1 mm; scales 5 or more, conspicuously unequal in length, overlapping; leaves acute to obtuse .................................................... A. viridis

1. Mature vegetative buds all with evident stalks; scales 2(3), of nearly equal length, not overlapping; leaves ovate to elliptic....................................................... A. incana ssp. rugosa

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