Philadelphus coronarius is a shrub to 4 m tall, colonial from root sprouts, older bark grooved, shreddy, pale, brown, branching opposite, stems arching, rather weak, brittle, young twigs brown, leaf scars horse-shoe shaped, with winter bud in center, vein scars three.
Leaves opposite, egg-shaped, 4-8 cm long, tip long-pointed, margin slightly toothed.
Flowers white very fragrant, 2.5-3.5 cm wide, regular, petals 4, stamens yellow, numerous, calyx lobes 4, from an enlarged base (hypanthium) in branched clusters of 5-7 in racemes (unbranched clusters), June-July.
Fruit a dry capsule with numerous seeds.
Wetland status: NL.
Frequency in NYC: Occasional.
Habitat: Escaped from cultivation. Can be aggressive.