Your search found 3 image(s) of petal shape in yellow-flowering Trilliums.
Clicking or hovering over any of the pictures below will display a larger image; clicking the plant's name will provide information about the plant pictured.
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Little Sweet Betsy,
Trillium cuneatum
Petals purple, brown, green or rarely yellow, >2x long as wide, per Wildflowers of the Eastern United States.
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Yellow Trillium,
Trillium luteum
Petals erect, somewhat overlapping concealing inner parts, not clawed, per Trilliums of Georgia. Tipularia (Patrick, 2007).
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Pale Yellow Trillium,
Trillium discolor
The only sessile-flowered Trillium with clawed spatulate pale yellow petals, per Wildflowers of the Eastern United States.