Originally named Rebutia einsteinii var. euanthema, which is now regarded as A. oculata. Found at Volcán, Jujuy in Argentina at

This rather sprawling plant with brick-red flowers was found by Karel Kníže at Ballestro, Potosi, Bolivia, but subsequently similar plants

Sometimes listed as A. mairiana or A. mairana or A. mairanensis, this large-bodied plant was found at Mairana, Santa Cruz,

Found by Karel Kníže at Challapata, Oruro, Bolivia, in 1977, at an altitude of 4100m.

This plant serves to illustrate the chaos which sometimes besets the naming of this genus. Bought as KK1932 from a

Found by Ralph Martin near Rio Honda, Potosi, N Camargo, at an altitude of 3250m, in 1999.

Found at Potosi, Camargo, by Ladislav Horacek.

Found by Hansjörg Jucker in Bolivia. I have not yet located more specific data for this plant.