The Trillium luteum is a yellow variant of the red Trillium Sessile. Like the sessile, the flower sits right on top of the three symmetric bracts at the end of the scape.
These pictures were taken in 2005 and 2006 in McCormick Creek’s State Park. In April one can find there mostly the Trillium Sessile, the Snow Trillium and the drooping trillium.
Back then, I had just started taking pictures of the local wildflowers, and took pictures of everything that didn’t appear too common. Sadly enough, I have never seen a yellow trillium again in Indiana.
The Inner Frame 