Lilac | plant genus | Britannica - Asian lilacs
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American gardeners are familiar with the legendary scent of the common lilac (Syringa vulgaris). But other members of the lilac clan, including most of the Asian. This fragrant hybrid (S. persica × S. vulgaris) has slightly nodding, 6-inch-long clusters of lilac-purple flowers. It forms a spreading shrub, 15 feet tall and wide.