Big Stapeliads All Pushing Blooms

These are the three big clumps that I have and they are all getting ready to flower at the same time.  This first one is the grandiflora and it has been blooming for a few months now.

This is the gigantea that has recently started blooming.  Notice the tip of the flower where the tips of the petals are - this is tighter than the grandiflora which tends to look more like a balloon.

And this is the mystery plant getting ready to bloom so I can finally identify it.

Maybe a couple more days before they open???