Idaho Trillium
Trillium petiolatum Pursh

Trillium petiolatum, known as the Idaho Trillium, is a flowering plant in the Melanthiaceae family. It is native to Idaho, Oregon, and Washington in the northwestern United States. The species was first described in 1813 by Pursh and is associated with the Lewis and Clark Expedition, as its type specimen was collected by Meriwether Lewis in 1806.
Description
Trillium petiolatum is a species of flowering plant in the Melanthiaceae family. It is found in the northwestern United States, specifically in Idaho, Oregon, and Washington. The plant is commonly known as the Idaho Trillium, long-petioled trillium, or round-leaved trillium. The species was first described in 1813 by Frederick Pursh. A significant historical note is that the type specimen was collected by Meriwether Lewis during the return journey of the Lewis and Clark Expedition in 1806.
Other common names
Idaho TrilliumIdaho WakerobinLong-petioled TrilliumPurple TrilliumRound-leaved Trillium
Distribution
Global · Idaho · Oregon · Washington
Synonyms
Trillium petiolatum f. luteum