[UV, VIS] Rudbeckia hirta

Here a shot, which shows an older and two younger Rudbeckia hirta flowers with different UV reflection (360nm region = yellow, but in the 385nm region = violet)


For comparison, here the VIS shot:

Klaus,

Splendid insight you give us!

Your work shows a vastly different geography to the flower on the lower left, that's more mature. I'd imagine that the pollinating insects then have 3d vision and the nectar to guide them.

Now, another idea I just had. any chance that the flower provides camouflage to the pollinating insect and protects it from predators while it's foraging. That would seem to be a great advantage to both and maybe needed in the open flat territory of this flower.

Asher