I have often wondered about the stability of registered (preliminary) cultivar 'Clumping Cultivar' (D'Amato) which is described in the ICPS Database as "these plants produce clumps of rosetted growing points, which result in a mound of densely packed leaves."
The photos below are of my outdoor bog which contains plants from seed that I collected from my typical VFTs. As you can see there are numerous growth forms including clumps, rosettes, upright, big traps, little traps, etc. All from the same seed batch. I have not experimented with the stability of the clumpy form when divided and replanted. My clumpy plants are not from the "official" clone of 'Clumping Cultivar'. I wonder how they are different. Does any clump of VFTs qualify as a 'Clumping Cultivar'?