Cactus horridus Pereskia humboldtii Pereskia vargasii Pereskia vargasii var. longispina Pereskia humboldtii var. rauhii Rhodocactus horridus Pereskia horrida subsp. rauhii Pereskia vargasii var. rauhii
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024