- Included species (for The Plant List, ):
- E. acida, E. breviflora, E. castanea, E. iquiquensis, E. procumbens
- Note: only species listed as 'Accepted'
- Included species (for Tropicos, ):
- E. acida, E. aricensis, E. barquitensis, E. breviflora, E. castanea, E. eburnea, E. iquiquensis, E. procumbens, E. ritteri, E. saint-pieana, E. spinibarbis
- Note: list containing potentially synonyms
- Note: Eulychnia is placed under Notocacteae (Tribus) < Cactoideae (Subfamilia) by GRIN and under Echinocereeae (Tribus) < Cactoideae (Subfamilia) by NCBI.
This category has the following 7 subcategories, out of 7 total.