Helianthus laetiflorus var. subrhomboideus Helianthus rigidus subsp. subrhomboideus Helianthus laetiflorus var. subrhomboideus Helianthus rigidus subsp. laetiflorus Helianthus pauciflorus var. subrhomboideus Helianthus subrhomboideus Helianthus rigidus var. subrhomboideus
Taxonomic data from World Flora Online, accessed June 20, 2024