Pseudotrillium

Taxobox | name = "Pseudotrillium rivale"
regnum = Plantae
divisio = Magnoliophyta
classis = Liliopsida
ordo = Liliales
familia = Melanthiaceae
genus = "Pseudotrillium"
genus_authority = S.B. Farmer
species = "P. rivale"
binomial = "Pseudotrillium rivale"
binomial_authority = (S.Wats.) S. B. Farmer

"Pseudotrillium rivale" is a species of the Trilliaceae family. It is the only species in the genus "Pseudotrillium". "P. rivale" occurs in the Siskiyou Mountains of Oregon and California, often on soils of ultramafic origin. This spring-flowering herb grows 4-15 cm tall; its single flower has purple spots on its three petals, which are otherwise white.