| Name | Lactuca elongata Muhlenberg ex Willdenow |
| Authorship | Muhlenberg ex Willdenow |
| Rank | Species |
| Placed in | Lactuca Linnaeus |
| Contains | Lactuca elongata var. sanguinea (Bigelow) Torrey & A. Gray |
| Citation | 1803 Sp. Pl., ed. 4 [Willd.]. 3(3): 1525 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Lactuca elongata Muhlenberg ex Willdenow |
| Identification made in | [no date] (4) |
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