Dyckia argentea ...or what should be

Technically Dyckia argentea is a mistake and really does not exist
´cause the plant used for describing was not a Dyckia but a Hechtia.

Casually this is A Dyckia native to Serra do Lenheiro Minas Gerais and the one that should be
used fort the description of Dyckia argentea.

This is a ultra rare Dyckia species and it will take a time to be seen abroad.
The plant is a majestic one.
Impressive as it is a big one.