Flower Side Between Petals, Including Antenna
Duck Mountain Provincial Park
The flower has an unusual pollination mechanism. While the flower is still in bud, the anthers dehisce but do not release their pollen. One of the four petals has an "antenna" arising near the petal apex. When an insect bumps the antenna, the flower opens explosively. The petals reflex and the anthers snap upwards from a reflexed position throwing pollen into the air. Some of the pollen will land on the insect, which will sometimes transport it to the stigma of another flower. The above is a summary of a description by Dr. A. Ceska. His report can be found here.
Note that the filaments have a bend roughly midway along their length.
Canadensis: Answers to key questions in Budd's Flora (BF) and Flora of Alberta (FOA) leading to this species.
Cornaceae: Answers to key questions in Budd's Flora leading to this family. Not all the answers apply to all members of this family, but they all do apply to this species.