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Philadelphus (mock orange, syringa; family Saxifragaceae) A genus of shrubs, formerly placed in the family Hydrangeaceae, that have opposite leaves and attractive tetra-, penta-, or hexamerous flowers with white petals, many stamens, and a 4-celled ovary. The name ‘syringa’ is often incorrectly used for this genus; Syringa is actually the scientific name for lilac. There are 65 species in the northern temperate zone, especially in eastern Asia and N. America. The genus is much cultivated for the fragrant flowers, which smell like and superficially resemble orange blossom.

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