| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Euphorbiaceae | Mercurialis annua | Annual Mercury, Boys-and-Girls, Herb Mercury | Disturbed areas, waif on ballast. | Native of Mediterranean Europe. This species has been reported as a rare ‘ballast weed’ from Charleston, SC and Mobile, AL (Wiggins 1932); some of the occurrences presumably represent non-persistent waifs. |  |
| Euphorbiaceae | Mercurialis perennis | Dog's Mercury | Waif on ballast. | Native of Europe. |  |
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