Giant Trillium, Sessile Trillium: Trillium albidum ssp. albidum (Synonym: Trillium chloropetalum) -
Small-flowered Trillium: Trillium albidum ssp. parviflorum (Synonyms: Trillium chloropetalum, Trillium parviflorum) -
Giant Purple Wakerobin: Trillium kurabayashii (Synonyms: Trillium angustipetalum, Trillium chloropetalum) - ?
Pacific Trillium, Western Wake-robin, Western Trillium: Trillium ovatum ssp. ovatum (Synonym: Trillium ovatum var. ovatum) -
Brook Trillium: Trillium rivale (Synonym: Pseudotrillium rivale) -