Your search found 5 image(s) of involucral bracts of Wild Lettuce.
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Prickly Lettuce,
Lactuca serriola
Involucres 10-15mm long, 3-5mm broad. Bracts imbricate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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American Wild Lettuce,
Lactuca canadensis
Orange-yellow flowers extend slightly from urn-shaped involucral cylinders, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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Red Wood Lettuce,
Lactuca hirsuta
Fruiting involucres 15-22mm tall (vs. those of L. canadensis 10-15mm tall), per Weakley's Flora (2020).
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Red Wood Lettuce,
Lactuca hirsuta
Flowers heads relatively large, the involucres measuring 1/2"+ in height, per Wildflowers of the Southern Mountains (Smith, 1998).
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Woodland Lettuce,
Lactuca floridana
Heads cylindric or tapering inward toward apex. Bracts imbricate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).