Common Name: 
Flowering Quince

Three species of deciduous shrubs often with thorny branches.  Leaves simple, alternate, serrate; with large stipules.  Flowers solitary or several together, calyx and corolla 5-parted, 40-60 stamens.  Fruit a fragrant pome.  Native to eastern Asia.  Closely related to the common quince (Cydonia oblonga) which has entire leaf margins, fewer stamens (20+), and styles basally connate (i.e., fused).
Chaenomeles: from the Greek chainein, to gape, and melon, apple, a reference to the incorrect belief that the fruit is split.