Well, an entomologist friend of mine (John Mugg - Director of the MSU
Botany
Teaching Greenhouses - and member of the server). Once told me that
_Pinguiculas_ were pollinated by moths or butterflies (maybe
Hummingbirds). If I remember the flower structure correctly a long
tube-like structure protrudes out the back of the flower. He stated
that the insects insert their probiscus(sp), a long furled mouth-piece,
into the length of the previously mentioned tube to drink nectar.
Thereby retrieving pollen to pollinate another plant and/or for
self-pollination.
I apologize for my lack of scientific names and for any possible
mistakes. That was all from a conversation over 3 years ago.
JMS