| Author | (Walter) L.C. Richard | |
| Distribution | Southern Coastal Plain; disjunct inland to Stanly and Mecklenburg counties. Known so far from the Lumber and Neuse rivers, plus an unnamed wetland in Stanly County. The Mecklenburg County specimen record came in fall 2022.
NC to MO, south to FL and TX; locally in Mex. | |
| Abundance | Rare to locally uncommon along the lower Lumber River, but very rare and declining elsewhere. This is a Significantly Rare species. | |
| Habitat | River banks and adjacent shallow water, roadside openings in swamp forests, ballast ground (Wilmington, New Hanover Co.). | |
| Phenology | Flowering and fruiting July-October. | |
| Identification | The species is readily identified by its opposite lanceolate leaves and small heads on long stalks, with yellow ray flowers and dull yellow disk flowers. The riverside habitat also limits the possible yellow-flowered candidates, as does its sprawling habit. | |
| Taxonomic Comments | For many years treated as Spilanthes americana . A synonym is Acmella oppositifolia var. repens.
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| Other Common Name(s) | Opposite-leaf Spotflower | |
| State Rank | S1 | |
| Global Rank | G5T5 [G5] | |
| State Status | SR-D | |
| US Status | | |
| USACE-agcp | FACW link |
| USACE-emp | FACW link |
