Donati D., Grusonia pulvinata, a new sibling species within G. vilis s.l. (Opuntioideae: Cactaceae), Phytotaxa, 2025, 712(2):87-106, doi: 10.11646/phytotaxa.712.2.1
A description of Grusonia pulvinata from the alluvial plains of San Luis Potosí and Zacatecas, and the new combination Grusonia grahamii subsp. vilis. The abstract identifies differences in segment joints, reproduction, ecology and karyology.