构属(Broussonetia)是桑科的其中一属，原产于东亚。

藤蟠 ─ Broussonetia kaempferi
小构树 ─ Broussonetia kazinoki
落叶花桑 ─ Broussonetia kurzii
构树 ─ Broussonetia papyrifera

Broussonetia is a genus of four species of trees in the family Moraceae, native to eastern Asia. One of these is the paper mulberry (Broussonetia papyrifera), whose bark fiber is used to make high-quality paper, particularly in Japan. This species has been widely introduced and has become invasive in some areas.