| Name | Lactuca canadensis var. longifolia (Michaux) Farwell |
| Authorship | (Michaux) Farwell |
| Rank | Variety |
| Placed in | Lactuca canadensis Linnaeus |
| Citation | 1923 Pap. Michigan Acad. Sci. 2: 45 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Lactuca canadensis var. longifolia (Michaux) Farwell |
| Identification made in | [no date] (2) |
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