Flowering Plants

I have two A. Crispus(?) which are flowering, one has 3 flowers and the 
other 1.  One of the flowers appears to have run its course and my 
question is do I cut the inflorescence at the base or will it break pff 
on its own.

Also my Anubus appears to be forming a flower, will it reach above the 
surface like the Crispus or will it remain submerged?  From the picture 
I have appears that it will stay submersed.

Finally, the Ludwigia Repens has begun to grow out of the tank it is 
in.  According to a book I have supposedly, it will flower in the 
emersed state.  Has anyone observed this?

Thank you in advance.