Trillium petiolatum
 Trillium petiolatum (round leaf trillium Idaho trillium) is a species of Trillium native to the Western United States; particularly Idaho Oregon and Washington. It is somewhat unique among Trillium species as it has round petiolate leaves and flowers close to the ground as opposed to most other Trillium species which flower above the leaves. The plant is small measuring just a few inches tall.