Helianthemum biseriale Helianthemum papillosum Helianthemum pediforme Helianthemum papillare var. pediforme Helianthemum niloticum subsp. papillare Helianthemum villosum f. intermedium Helianthemum villosum var. papillare
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024