Philadelphus mexicanus  Philadelphus mexicanus is a shrub belonging to the genus "Philadelphus", native to Mexico and Guatemala. It is a spreading, evergreen shrub with pendent, bristly shoots and ovate, sometimes partly toothed leaves up to long. Flowers are single, cup shaped, rose scented, creamy white in colour, measuring up to across. "Rose syringa" (syn. "Philadelphus maculatus") is the most commonly cultivated variety and has fragrant white flowers with a purple blotch in the centre.