You selected Erythronium grandiflorum forma giganteum (Lindl.) Voss. This is a synonym for:

Accepted scientific name:
Erythronium californicum Purdy (accepted name) 1 literature reference for Erythronium californicum Purdy
Synonyms:
Erythronium bolanderi (S.Watson) Baker (synonym) 1 literature reference for Erythronium bolanderi (S.Watson) Baker
Erythronium giganteum Lindl. (synonym) 1 literature reference for Erythronium giganteum Lindl.
Erythronium grandiflorum var. giganteum (Lindl.) Hook. (synonym) 1 literature reference for Erythronium grandiflorum var. giganteum (Lindl.) Hook.
Erythronium grandiflorum forma giganteum (Lindl.) Voss (synonym) 1 literature reference for Erythronium grandiflorum forma giganteum (Lindl.) Voss
Erythronium revolutum var. bolanderi S.Watson (synonym) 1 literature reference for Erythronium revolutum var. bolanderi S.Watson
Common names: -
Classification:
Plantae
Phylum Magnoliophyta
Class Liliopsida
Order Liliales
Family Liliaceae
Genus Erythronium
Distribution: NW. California
Additional data: -
Source database: World Checklist of Selected Plant Families, 27 Nov 2009
Latest taxonomic scrutiny: Govaerts R., 06-Jan-2005
Online resource: http://apps.kew.org/wcsp/namedetail.do?accepted_id=305748&repSynonym_id=-9998&name_id=305748&status=true
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:2635e76e-60a7-102d-be47-00304854f810:ac2010