Species: 5.
Geography: Chile, Peru.
- Eulychnia acida Philippi 1864, (Atacama, Chile)
- Eulychnia breviflora Philippi 1860, (coast of northern Chile)
= Cereus longispinus Salm-Dyck 1845,
= Eulychnia longispinus (Salm-Dyck) F. Ritter 1965
= Eulychnia procumbens Backeberg 1963 n.v.p.
= Eulychnia aricensis F. Ritter 1964
= Eulychnia saint-pieana F. Ritter 1964
= Eulychnia barquitensis F. Ritter 1980
- Eulychnia castanea Philippi 1864, (Coquimbo, Chile)
= Cereus castaneus (Philippi) K. Schumann 1903,
= Philippicereus castaneus Backeberg 1942
- Eulychnia iquiquensis (K. Schumann) Britton et Rose 1920, (Tarapacá, Chile)
= Cereus iquiquensis K. Schumann 1904,
= Eulychnia morromorenoensis F. Ritter 1980
- Eulychnia ritteri Cullmann 1958, (Arequipa, Peru)
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