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... is Trillium grandiflorum.
...for using the correct speeling is that once you do, the ID will "link" to other IDs of the same species, which makes the observation more valuable and more interesting, as you can compare it to others.
Katy, if you'd put up another ID (if in doubt about the speeling, use the "get recommended" button once you have typed in Trillium) then we can transfer our agreements to that one.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 57.5, -3.8
OS grid ref: NH9355