Suleyman Demir notes:
At young stage, the tubercles are flat and seperated by a deep sulcus only, then they are extended.
The forms North of the Sierra de Paila are more strongly spined named forma valida than the ones South of it. This sp. has one to five yellow-orange glands on the wooly tubercule groove.
The color of the large flowers (6-7 cm. in diameter) varies from whitish-rose with pink center to carminred and in San Luis Potosí even yellow-flowering forms occur.
This picture is C.poselgeriana f.valida.
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