I put the pics of warnockii (kakui form) and durangensis in a row just to show how similar they are, the only distinguishing characters being the presence of a long lower central in durangensis which is wanting in warnockii. Besides that the color of the stem is darker in warnockii and of course the flowers are pretty much different.
I took a few pictures today
the other form of durangensis with yellowish spines
And talking about unguispinus (or durangensis) mapimiensis
the plant coming from a german nursery, which I suspect being sb1090 (it didn' t flower yet
) but is nice
These are seedlings of sb1090, I would be curious to see yours
These are seedlings of durangensis from self produced seeds
this one looking much warnockii like
coming to warnockii these are 2 yrs old seedlings from the kakui plant, possibly hybrids as this is the only flowering size warnockii I am growing
little bit older warnockii
warnockii gdl31 (don' t find however this in the fndatabase...)
These warnockii seedlings look quite similar and I am curious to see if there is any difference in the flowers. E. kakui was introduced by Backeberg as a provisional name for pallidus, withouth type sp. and is treated by most as syn. of Warnockii as Echinocactus erectocentrus var. pallidus Weniger.
I took also some pictures of intertextus, but that' s for another post