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Pyramidal spiraea is a rhizomatous shrub with erect or spreading branches, 5-10 dm (20-40 in) tall. The alternate leaves are elliptic and 2-7 cm (1-3 in) long with margins that are entire below but sharply toothed above. Leaves and stems are generally short-hairy. Numerous tiny flowers occur in finely branched globose clusters that are grouped in a pyramid-shaped inflorescence, 5-10 cm (2-4 in) ...