Pelecyphora minima (Baird) D.Aquino & Dan. Sanchez comb. nov.

Coryphantha minima ≡ Coryphantha minima Baird, Amer. Bot. (Binghamton) 37: 150. 1931. Escobaria minima (Baird) D.R.Hunt, Cact. Succ. J. Gr. Brit. 40: 30. 1978. Neobesseya minima (Baird) Lodé, Cact.-Avent. Int. 98(Suppl.): 7. 2013. Type: United States, Texas, near Marathon, Mar 1931, A. R. Davis s.n (lectotype, designated by Benson, Cacti U. S. Canada: 959. 1982: US [1530466 image!]).

Coryphantha nellieae = Coryphantha nellieae Croizat, Torreya 34: 15. 1934. Escobaria nellieae (Croizat) Backeb., Cactaceae 5: 2967. 1961. Mammillaria nellieae (Croizat) Croizat, Cact. Succ. J. (Los Angeles) 14: 34. 1942. Type. United States, Texas, about 4 miles south of Marathon, in limestone formations, Davis s.n. (holotype: NY).