mughal, you're welcome and thank you for the nice comment!
hegar, yes, that is where they are!
remarkable that your turbs survive outside, what's a tarp?
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)