| Author | Aiton | |
| Distribution | Coastal Plain and Sandhills; Montgomery, Randolph, and Catawba counties in the Piedmont.
Native of Africa; in N.A. -- VA to FL and MS. | |
| Abundance | Frequent, except rare in the Piedmont. | |
| Habitat | Fallow fields, crop fields, roadsides, waste ground, etc. | |
| Phenology | Flowering July-September. | |
| Identification | Smooth Rattlebox is erect, and leaves are divided into 3 obovate leaflets. All other rattleboxes in NC have either lanceolate leaves that are trifoliate, or all leaves are unifoliate. The pod is conspicuously curved, versus straight in C. incana, which is not in the NC flora. | |
| Taxonomic Comments | Our plants are var. obovata. The name C. mucronata has in the past been misapplied to this plant.
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| Other Common Name(s) | | |
| State Rank | SE * | |
| Global Rank | GNR | |
| State Status | | |
| US Status | | |
| USACE-agcp | FACU link |
| USACE-emp | FACU link |
