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In page Rebutia:

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The variation in the treatment of the genus is illustrated by the difference between Mosti et al., who in 2011 treated Aylostera and Weingartia (including Cintia and Sulcorebutia) as distinct from Rebutia,[2] and the Plant List, which as of March 2013[update] separated Cintia, Sulcorebutia and Weingartia from Rebutia, but merged Aylostera.[3]