I too have long wondered about that plant from Soledad that is marketed as A. marmorata. It is very smooth, and looks nothing like either the blue, desert form found around Tehuacan or the greener form found higher up in the mountains elsewhere in Oaxaca. I don't know it's origin, and would be curious also.
Lina's plants are definitely the xeric form of A. marmorata.
Greg
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