Parodia ritteriana A. S. Oliveira & R. Pontes 2022, comb. nov.

Parodia ritteriana (Lisal & Kolarik) A. S. Oliveira & R. Pontes comb. nov. ≡ Notocactus ritterianus Lisal & Kolarik (1986: 5) The species grows on vulcanic rocks and it is classified as critically endangered (CR) in its native habitat (IUCN 2022). The populations found are small and disjunct in an area of about 14 km 2. The threats observed were human activities associated with agriculture (removal of soil cover and removal of stones from the field) and livestock (grazing).Published as part of Oliveira, Anabela Silveira De, Pontes, Rodrigo Corrêa, Robaina, Luis Eduardo De Souza & Trentin, Romário, 2022, The Cactaceae family in the Santa Maria river basin (Rio Grande do Sul, Brazil), pp. 153-166 in Phytotaxa 542 (2) on page 162, DOI: 10.11646/phytotaxa.542.2.3, http://zenodo.org/record/641354