Arrojadoa eriocaulis Buining & Brederoo in Kakteen And. Sukk. 24(11): 241. 1973 sec. Zappi & Taylor 2020
- ≡Arrojadoa dinae subsp. eriocaulis (Buining & Brederoo) N.P.Taylor & Zappi in Cactaceae Consensus Init. 3: 7. 1997 syn. sec. ???
- =Arrojadoa eriocaulis var. albicoronata Van Heek, R.J.Paul, Heimen, Hovens & W.Strecker in Kakteen And. Sukk. 33: 227. 1982 syn. sec. Hunt 2016
- ≡Arrojadoa eriocaulis subsp. albicoronata (Van Heek, R.J.Paul, Heimen, Hovens & W.Strecker) P.J.Braun & Esteves in Succulenta (Netherlands) 74: 82. 1995 syn. sec. Hunt 2016
- ≡Arrojadoa albicoronata (Van Heek, R.J.Paul, Heimen, Hovens & W.Strecker) P.J.Braun & Esteves in Cact. Succ. J. (Los Angeles) 79: 262. 2007 syn. sec. Taylor & Zappi 2004
- =Arrojadoa eriocaulis var. rosenbergeriana Van Heek & W.Strecker in Kakteen And. Sukk. 44: 262. 1993 syn. sec. Taylor & Zappi 2004
- ≡Arrojadoa rosenbergeriana (Van Heek & W.Strecker) P.J.Braun, Esteves & Van Heek in Cact. Succ. J. (Los Angeles) 79: 260. 2007 syn. sec. Taylor & Zappi 2004