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A woody plant (Spiraea tomentosa) in the rose family, native to eastern North America, having leaves with rusty down on the undersides and spikelike clusters of small rose-purple flowers. Also called steeplebush.
(Plants) a woody North American rosaceous plant, Spiraea tomentosa, with downy leaves and tapering clusters of small pink or white flowers. Also called: steeplebush
a woolly-leaved North American shrub, Spiraea tomentosa, of the rose family, having short, spikelike clusters of rose-colored flowers. Also called steeplebush.