Helianthus grosseserratus subsp. grosseserratus Helianthus instabilis Helianthus grosseserratus var. hypoleucus Helianthus grosseserratus subsp. maximus Helianthus grosseserratus var. grosseserratus Helianthus grosseserratus f. grosseserratus
World Flora Online, accessed June 20, 2024