One of my favourite garden plants is Rodgersia pinnata, a member of the Saxifragaceae from temperate East Asia. I planted it for the attractive leaves.
I believe these are dermestid beetles, of the odious carpet beetle gang. I always associate them with the defleshing of zoological specimens, or the attacking of poorly-preserved taxidermy. (The larvae dine on such putrefying things.) I didn't expect them to be drawn to a pleasant-smelling plant, but apparently they are, and feed on pollen(?). Perhaps a different species?
An interesting question--and a great plant, that not only has interesting leaves, but also provides zoologica to puzzle over.