Lobivia arachnacantha Buin. & Ritt. Succ. 1956/37
- Echinopsis arachnacantha Friedr., K.u.a.S. 1974/82

Lobivia arachnacantha var. densiseta Rausch K.u.a.S. 1968/49
- Echinopsis arachnacantha var. vallegrandensis Rausch, K.u.a.S. 1975/1

Lobivia arachnacantha var. sulphurea Vasqu. Succ. 1974/108

Lobivia arachnacantha var. torrecillasensis (Card.) Backb. Kaktlex. 1966/203
- Echinopsis torrecillasensis Card., C.a.S.J. 1956/10

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