Regarded by some as a form of Aylostera eos, A. haagei or A. pygmaea. A lot of confusion exists in nurseries and growers between A. pelzliana and other pink / whitish flowered larger Mediolobivias. Described as “muted red” in colour rather than pink, and with thinner spines than A. eos.
The description is here.
Plants of this species in the collection include: