Gasteria is in the Alooideae genus, predominantly confined to Africa, Madagascar and adjacent regions, but the main centres of species diversity are in Southern Africa. Gasteria is a well-defined, natural and monophyletic (can be separated from the root with a single cut, whereas a non-monophyletic group needs two or more cuts) group. Gasteria is at once distinguished from related genera, especially Aloe to which it bears close resemblance. Gasterias are slow-growing xerophytic perennial plants which vary in height, spread etc
