| Asteraceae |
|
Helianthus angustifolius
| L. | Sp. Pl. 2: 906 | 1753 |
| Asteraceae |
|
Helianthus angustifolius var. angustifolius
| | | |
| Asteraceae |
|
Helianthus angustifolius var. nemorosus
| C. Mohr | Contr. U.S. Natl. Herb. 6: 800 | 1901 |
| Asteraceae |
|
Helianthus angustifolius var. planifolius
| Fernald | Rhodora 49(583): 190, pl. 1083 | 1947 |