| Author | L. | |
| Distribution | Scattered in the southern Piedmont, southern Coastal Plain, and Outer Banks of Dare and Currituck counties. First collected in 1957 along railroads in Duplin and Robeson counties. A specimen from 4750 feet in McDowell County appears to be H. radicata.
Native of Europe; in N.A. ME to IL south to FL and TX; also B.C. to CA. | |
| Abundance | Apparently rare, but spreading in recent years. No doubt also overlooked. | |
| Habitat | Dry to mesic roadsides, railroads, gasline, granitic flatrocks (Anson Co.), weedy shop front. | |
| Phenology | Flowering and fruiting April-July. | |
| Identification | Smooth Cat's-ear has glabrous or glabrate basal rosette leaves (vs. hispid-hairy basal leaves in the quite common H. radicata). | |
| Taxonomic Comments | | |
| Other Common Name(s) | | |
| State Rank | SE | |
| Global Rank | GNR | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
