Escobaria is a often overlooked genus, but I think the plants are very interesting. Not many genera that can claim to exist from Canada to Mexico! That about 2000 miles, or 3200kms. Maybe only Opuntia as a genus beats it, and it has so many different species. With Escobaria there are much fewer species, and of course E.vivipara is just an amazing plant from a distribution point of view.
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Chris43, moderator