sweet pepperbush

[ pep-er-boo sh ]
/ ˈpɛp ərˌbʊʃ /

noun

a shrub, Clethra alnifolia, of the eastern and southern coastal U.S., having numerous erect clusters of white or pinkish flowers.
Also called summer-sweet, white alder.

Origin of sweet pepperbush

An Americanism dating back to 1830–40