For the second year in a row, this plant has flowered in my garden. I don't remember planting it and have no idea what it is or how it got there. Pretty sure it's not a weed though.
It only started flowering a week ago but is in a very shady location, sort of a hosta-type area for sunlight. Am considering replanting it to a sunnier location next spring if it will tolerate more sun.
There's a picture of it at:
You could also try rec.gardens and alt.binaries.pictures.gardens
Looks like a wild tiger lily
It's a variety Japanese Toad Lily (_Trycirtis_ species, possibly T. hirta). Best in a woodland or part-shade garden (morning sun rather than afternoon sun).
An assortment of Toad Lilies to look at here (scroll down):
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