Suleyman Demir notes:
Section Ottonis is characterized by Ortegocactus type areoles. It has complete grooves on the tubercles but sometimes not on all tubercles.
The heavier spined forms of the type sp. from Zacatecas and Durango known as C.guerkeana.
This is one of the few
white flowering taxon of the genus. The flowers are 6 cm in diameter and come freely between spring and fall.
-Suleyman Demir
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