Window flowers
Dennis Kramb (Fri, 05 Nov 2010 14:47:13 PDT)

I am only familiar with windows in carnivorous pitcher plants, Sarracenia.
The theory is that once under the hood of the pitcher, the insect mistakenly
thinks the window is a way out and is lured further into the trap. I have
no experience with windows on flowers, but seems like Nhu's explanation
makes good sense... that it must have something to do with the plant's
relationship with insects.

Dennis in Cincinnati