I looked it up in the pilbeam book and it said nothing about if e. parkerii ssp. gonzalezii is common or not
I bought it at a convention last year and haven't seen any other specimen anywhere since, so I guess it's indeed not very common
that knippelianus is very beautiful too, I bought it in bud about a week ago so the flower isn't from my effort, no matter, I like it a lot!
I wouldn't even dare growing any of these outside!
where in europe are you going this year?
With apologies to the late Professor C. D. Darlington the following misquotation springs to
mind ‘cactus taxonomy is the pursuit of the impossible by the incompetent’ - Fearn & Pearcy, Rebutia (1981)