Synonyms
Trillium sessile subsp. giganteum (Hook. & Arn.) A.E.Murray
Trillium giganteum (Hook. & Arn.) A.Heller
Trillium sessile var. giganteum Hook. & Arn.
Trillium sessile f. californicum (S.Watson) Farrer
Trillium chloropetalum subsp. giganteum (Hook. & Arn.) A.E.Murray
Trillium sessile var. californicum S.Watson