| Author | L. | |
| Distribution | Central and eastern Piedmont, Sandhills, and western half of the Coastal Plain; nearly absent from the outer Coastal Plain.
MD to KY and AR, south to FL and MS. Records north of these states are escapes from cultivation. | |
| Abundance | Fairly common to common in its range in the state; not found in the Mountains, western Piedmont, or lower Coastal Plain. | |
| Habitat | Dry to mesic soils of open pine-oak-hickory woodlands, rocky wooded slopes, wooded borders, and Longleaf Pine-Wiregrass sandhills and flats. | |
| Phenology | Flowering and fruiting May-July. | |
| Identification | Whorled Tickseed is easy to identify, due to its leaves finely dissected into threadlike segments. Stems usually grow 1-2 feet tall, with relatively small heads of yellow, untoothed rays and brownish disks. | |
| Taxonomic Comments | None
For excellent drawings of all species (except those recently described) and range maps (although now out-of-date), see the monograph by Smith (1976). | |
| Other Common Name(s) | Threadleaf Tickseed, Threadleaf Coreopsis | |
| State Rank | S4 [S5] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
