On the hover fly/nectary co-evolution issue.
It is just speculation, but could deeper
corolla lobes hold more nectar and so reward
visitors better? Or could longer lobes
be better for keeping the nectar from drying out
and so accumulate the nectar more efficiently?
Just a set of guesses. I do not go around
sticking my proboscis into this stuff...
Scott T. Meissner
smeissne at a1.mckendree.edu
