Cornus canadensis
"One of the fastest actions in the plant world is the explosive opening of flowers on the bunchberry dogwood, which happens in just under 0.5 milliseconds. As the flowers burst open, the petals quickly separate and flip back, exposing the stamens. During the first 0.3 milliseconds, researchers have calculated the stamens are exposed to a force 800 times greater than astronauts experience during blast-off. The mechanism, it is understood, allows pollen to be thrown upwards in order for it to be transported by the wind".