| Author | L. | |
| Distribution | Scattered across the state, with gaps that are without real meaning.
Native of the Midwestern U.S. and Canada; extensively cultivated and escaped elsewhere. | |
| Abundance | Rare to uncommon throughout. | |
| Habitat | Roadsides, railroad margins, fields, woods edges, pastures, campus weed. | |
| Phenology | Flowering and fruiting June-October. | |
| Identification | This is a quite robust herb, often reaching 6 feet tall and rarely to 9 feet tall. It is most readily recognized by the large, dark brown disc (to about 1.5-2 inches across), much broader than in our other sunflowers -- though not like the cultivated forms with disks many inches across. The leaves are triangular, with a truncate base, pointed tip, and small teeth on the margins. It can easily be confused with H. debilis, due to the broad disk and the triangular leaves. However, the involucral bracts of H. debilis are lanceolate and 1-3 mm wide, vs. rather ovate and 4-8 mm wide in H. annuus. | |
| Taxonomic Comments | | |
| Other Common Name(s) | | |
| State Rank | SE | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | FAC link |
| USACE-emp | FAC link |
