Compositae Working Group (CWG) (2024). Global Compositae Database.
Helianthus subtuberosus f. verticillatus (Lakela). Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1164640 on 2025-04-04
Marine Species Traits editorial board (2025). Marine Species Traits.
Helianthus subtuberosus f. verticillatus (Lakela). Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1164640 on 2025-04-04