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Lilac bushes are any speices of the genus syringa that are hardy deciduous shrubs of the olive family. The flowers, borne in dense, showy, branching inflorescences, have a four-toothed, united calyx (outer floral envelope); a four-lobed corolla (inner floral envelope); two stamens (male flower parts); and a solitary two-celled pistil (female flower part).
