| syringa | (n) genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs, Syn. genus Syringa |
| common lilac | (n) large European lilac naturalized in North America having heart-shaped ovate leaves and large panicles of highly fragrant lilac or white flowers, Syn. Syringa vulgaris |
| himalayan lilac | (n) robust upright shrub of mountains of northern India having oblong-elliptic leaves and pale lilac or white malodorous flowers, Syn. Syringa emodi |
| hungarian lilac | (n) central European upright shrub having elliptic leaves and upright clusters of lilac or deep violet flowers, Syn. Syringa josikaea, Syringa josikea |
| japanese lilac | (n) lilac of northern China having ovate leaves and profuse early summer rose-lilac flowers, Syn. Syringa villosa |
| japanese tree lilac | (n) small tree of Japan having narrow pointed leaves and creamy-white flowers, Syn. Syringa reticulata, Syringa amurensis japonica |
| mock orange | (n) large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes, Syn. syringa, Philadelphus coronarius |
| persian lilac | (n) small densely branching Asiatic shrub having lanceolate leaves and panicles of fragrant lilac flowers, Syn. Syringa persica |
