Helianthus laetiflorus var. rigidus (Desfontaines) Fernald

Helianthus laetiflorus var. rigidus (Desfontaines) Fernald is a synonym sensu FNA Ed. Comm., 2006c of:

Helianthus pauciflorus Nuttall subsp. pauciflorus, an accepted subspecies name sensu FNA Ed. Comm., 2006c.