Spiraea trilobata Threelobe Spirea 3 to 7   Northern China to Siberia and Turkestan Dense shrub 4 to 5 feet Pure white flowers May Alternate, simple, roundish, 1/2 to 1” long usually rounded to 3 lobes             'Swan Lake' - More flowers than the species 'Fairy Queen' - 3 feet high with masses of flowers in May to June

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