| Name | Sium suave f. carsonii (Durand ex A. Gray) Fassett |
| Authorship | (Durand ex A. Gray) Fassett |
| Rank | Forma |
| Placed in | Sium suave Walter |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Sium suave f. carsonii (Durand ex A. Gray) Fassett |
| Identification made in | [no date] (3) |
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