This hybrid looks like humifusa and cespitosa, but the flower colour is something different. Flower colour gets a bit darker as they age. Hard to tell the parents, but one of them was humifusa or cespitosa for sure.
This hybrid contains probably polyacantha and fragilis and perhaps more. Very nice flowers, nice spination as well.
This hybrid contains probably pinkavea, possibly fragilis or polyacantha or perhaps macrorhiza. Very nice flowers, not very spiny. Pads appear as a bit blue-green.
Small plant with no spines, only glochids. Stays low, spreads and flowers very willingly. Flower colour yellow, but fades to light pink. Unknown parentage, but certainly not pinkavea.
Intermediate plant with spines on the upper part of the plant and a lot! of glochids. Stays low, spreads and flowers very willingly. Flower colour yellow, more intense near the base. Originally acquired as humifusa New Jersey, but it is not a humifusa. Has possibly macrorhiza genes in it, but difficult to say.
This plant is a hybrid between compressa and aciculata. It has a lot less glochids than aciculata, but it does have the bigger pad size. Flowers are a sort of red, with more pink/magenta in the middle. I think that, given space, this will be a sizeable plant.
This plant is for sure a hybrid between polyacantha and ???. Could be just a polyacantha hybrid, or with macrorhiza or even fraglilis denudata. Very nice colour, nicely spined also. So far it stays relatively small.