Weingartia cacti belong to my favorites. Natural habitat of Weingartia species is located in Bolivia mountains. However, Weingartia neumanniana occurs near the border between Bolivia and Argentina in both countries.
There are two subgroups of Weingartia.
One of them which is often called Cumingia can be found at North from Potosi. These plants grow on rivers banks in a warm environment.
The other subgroup is called Weingartia and can be found at South [...]