Your search found 4 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.
Little Sweet Betsy,
Trillium cuneatum
Petals purple, brown, green or rarely yellow, >2x long as wide, per Wildflowers of the Eastern United States.
Yellow Trillium,
Trillium luteum
Petals erect, somewhat overlapping concealing inner parts, not clawed, per Trilliums of Georgia. Tipularia (Patrick, 2007).
Pale Yellow Trillium,
Trillium discolor
The only sessile-flowered Trillium with clawed spatulate pale yellow petals, per Wildflowers of the Eastern United States.