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CeanothusSee text Ceanothus is a genus of about 50-60 species of shrubs or small trees in the buckthorn family Rhamnaceae. The genus is confined to North America, with the center of its distribution in California but some species (e.g. C. americanus) in the eastern United States and southeast Canada, and others (e.g. C. coeruleus) extending as far south as Guatemala. Most are shrubs 0.5-3 m tall, but C. arboreus and C. thyrsiflorus, both from California, can be small trees up to 6-7 m tall. The majority of the species are evergreen, but the handful of species adapted to cold winters are deciduous. The leaves are opposite or alternate (depending on species), small (typically 1-5 cm long), simple, and mostly with serrated margins. The flowers are white, blue, pale purple or pink, maturing into a dry, three-lobed seed capsule. Many of the Californian species are known as California-lilac, but not surprisingly, the species found elsewhere have other common names, e.g. New Jersey Tea for C. americanus. In garden use, most are simply called by their scientific names or an adaptation of the scientific name, e.g. Maritime Ceanothus for C. maritimus. Many species are popular garden ornamentals, and dozens of hybrids and cultivars have been selected.
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