white alder
1. tree of western United States • Syn: mountain alder, Alnus rhombifolia • Hypernyms: alder, alder tree • Member Holonyms: Alnus, genus Alnus 2. shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers • Syn: sweet pepperbush, pepper bush, summer sweet, Clethra alnifolia • Hypernyms: shrub, bush
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