Bidens - What's all the fuss?

TPP finds it hard to understand why everyone is so interested in Bidens.  This genus of flowering plants is in the Aster family, and it's most generally known common name is beggerticks.  The fruits sport a pair of bristles at one end that are very good at hitching a ride upon animal pelts or their artificial equivalents worn by humans.  Hard to know how many times TPP has returned home from the field and had to pull dozens of these hitchhiking fruits from his clothing.  Although the flowers are largely yellow, breeders have selected for larger blooms and more colors including reds, oranges, and white.  And unless you are quite diligent about picking off the spent flowers you may find yourself lugging around fruits from your own flower garden.
Actually TPP was pretty sure the Bidens in question were of the human variety, and not nearly as interesting as the plants. At any rate this seemed like a good idea to get a volume of traffic to read this blog.