The following multispectral images of mine they used where shot in my studio and outside with my "work horse" UV-Nikkor f4.5/105mm quartz fluorite lens using the Baader UV/IR Cut filter and my proprietary XBV filters for simulated bee vision. Light source used was a Xenon flash modified for high UV output and sunlight outside.
[click on image to see a larger one]
Bidens Human Vision (VIS):

Bidens simulated Bee Vision:

Gazania Human Vision (VIS):

Gazania simulated Bee Vision:

Rudbeckia Human Vision (VIS):

Rudbeckia simulated Bee Vision:

All these flowers have very specific UV patterns; the outer part of their petals are UV reflective around 360nm, but their inner parts show a UV-dark area which gets nicely visible.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos