| Name | Trillium sessile var. giganteum Hooker & Arnott |
| Authorship | Hooker & Arnott |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Trillium sessile Linnaeus |
| GUID | urn:lsid:ipni.org:names:258383-2 |
| Citation | 1840 Bot. Beechey Voy. 402 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Trillium sessile var. giganteum Hooker & Arnott |
| Identification made in | [no date] (1) |