Copiapoa marginata subsp. robustispina Copiapoa marginata subsp. marginata
Copiapoa streptocaulon Echinocactus columnaris Echinocactus streptocaulon Echinocactus marginatus Echinocactus melanochnus
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024