Compositae Working Group (CWG) (2024). Global Compositae Database.
Heterotheca fulcrata var. senilis (Wooton & Standl.) Semple. Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1156725 on 2025-03-14
Marine Species Traits editorial board (2025). Marine Species Traits.
Heterotheca fulcrata var. senilis (Wooton & Standl.) Semple. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1156725 on 2025-03-14