Non-perianthial flower 无被花: poplar杨树 A: a male flower of poplar B: a male flower with stamens removed 1. Flower disc 2. Bracts 3. Stamen BNon-perianthial flower 无被花：poplar 杨树 A: a male flower of poplar B: a male flower with stamens removed 1. Flower disc 2. Bracts 3. Stamen