Iris asks: ...what is the purpose 
of the twist in the petals of this group?

Harold Koopowitz wrote an article for Orchids Digest (Vol. 69/4 2005) that 
offers explanations for this as well as other adaptations. 

In brief, the twisting enhances the visibility of the flower to its 
pollinators, based upon the characteristics of insect vision.

Regards,
Rick Barry 

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