| Name | Myriophyllum ambiguum var. capillaceum (Torrey) Torrey & A. Gray |
| Authorship | (Torrey) Torrey & A. Gray |
| Rank | Variety |
| Placed in | Myriophyllum ambiguum Nuttall |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Myriophyllum ambiguum var. capillaceum (Torrey) Torrey & A. Gray |
| Identification made in | [no date] (2) |