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Although Platanthera chorisiana (Orchidaceae) was reportedly collected in 1912 from Lake Serene (near Edmonds), Snohomish County, Washington State, no other information about this site or collection was known. Since this original collection, it has been collected three more times in the state. Because this State Threatened orchid has never been relocated at the Edmonds site, and because it does occur at Lake Serene, near Mount Index, Snohomish County, Washington State, I reviewed potentially relevant literature and archives starting with the collection year. I documented its collection at Lake Serene, near Mount Index. The 1912 specimen passed from Harry B. Hinman, the collector and a member of the Mountaineers, to Donovan Correll, in Texas. The orchid has persisted at Lake Serene, near Mount Index, for at least 90 yrs.