That's as far as it Darlingtonia flowers will open. The anthers are fairly well recessed near the base of the petals too.
This thread on ICPS shows the anatomy of Darlingtonia flowers:
http://icps.proboards.com/index.cgi?board=darlingtonia&action=display&thread=1845
From the photos you can see why the larger European honey bees have difficulty pollinating these flowers.
Only one of my flowers developed normally, the other 3-4 did/have not grown stalks. One of these opened (deformed) still at the base of the plant. I did find an infestation of mealybugs which may be the problem.