Spiraea, is a genus of about 80-100 species of shrubs in the family Rosaceae. They are native to the temperate Northern Hemisphere, with the greatest diversity in eastern Asia. Spiraea species are used as food plants by the larvae of some Lepidoptera species including Brown-tail, Emperor Moth, Grey Dagger, Hypercompe indecisa and Setaceous Hebrew Character. The genus was formerly treated as also containing the herbaceous species now segregated into the genera Filipendula and Aruncus; recent genetic evidence has shown that Filipendula is only distantly related to Spiraea, belonging in the subfamily Rosoideae. Spiraea plants are hardy, deciduous-leaved shrubs. The leaves are simple and usually short stalked in an alternate (i.e. spiral) arrangement. In most species, the leaves are lanceolate (narrowly oval) and about 1 to 4 inches (2.5 to 10 cm) long. The leaf margins are usually toothed, occasionally cut or lobed, and rarely smooth. Stipules are absent.
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