Pinto R., Estado de conservación de Eulychnia iquiquensis (Schumann) Britton et rose (Cactaceae) en el extremo norte de Chile, Gayana. Botánica, 2007, 64(1):98-109, doi: 10.4067/S0717-66432007000100010
A field survey of coastal Eulychnia iquiquensis populations in northern Chile in 2001 and 2005. The paper describes growth form, distribution on fog-exposed slopes, plant condition, flowering during a wet episode and retained dead trunks. It compares different methods of abundance assessment depending on site accessibility. Threat assessments and population data concern the period studied and the taxonomic circumscription used at the time.