Thank you. These ones are so cool too as you can suck unsuspecting guests into sniffing them and touching the trigger. My son's girlfriend about had a fit when she got 'shot'; it was hilarious!
The trigger is that hook like bit coming from the column. When an insect (or a person's nose ) touches it the trigger fires the pollen which then sticks to whatever is there and be carried on to a female flower to pollinate it.