Astrophytum myriostigma subvar. nudum (Rud.Mey.) Backeb., Cactaceae 5: 2662. 1961 Astrophytum myriostigma subvar. nudum (Rud.Mey.) Backeb., Cactaceae 5: 2662. 1961is new combination for Echinocactus myriostigma var. nudus Rud.Mey. in Monatsschr. Kakteenk. 22: 136. 1912Taxon for this nameAstrophytum myriostigma subvar. nudum (Rud.Mey.) Backeb.