Giant Purple Wakerobin, Kurabayashii's Wakerobin: Trillium kurabayashii (Synonyms: Trillium angustipetalum, Trillium chloropetalum) - Leaves mottled with dark and light splotches on a green back ground. Flowers sessile, situated directly atop the trio of leaves. Petals and sepals maroon in color, the petals closely erect. Introduced and possibly naturalized in the Columbia River Gorge.
Pacific Trillium, Western Wake-robin, Western Trillium: Trillium ovatum ssp. ovatum (Synonym: Trillium ovatum var. ovatum) - Leaves typically solid green on their upper leaf surface. Flowers held above the trio of leaves on a thick stem or peduncle. Petals are white, aging to purple or maroon. Sepals greenish and smaller than the petals.