Therocistus echioides Xolantha echioides Cistus echioides Helianthemum echioides Helianthemum heterodoxum Helianthemum scorpioides Helianthemum echioides var. heterodoxum Helianthemum echioides var. laxum
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024