Your search found 13 image(s) of involucral bracts of Thistles.
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Bull Thistle,
Cirsium vulgare
Involucral bracts narrowly pointed, rigid, not sticky, per Wildflowers in the Field and Forest: Northeastern US (Clemants & Gracie, 2006).
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Common Yellow Thistle,
Cirsium horridulum var. horridulum
Flower heads more or less enclosed by an outer whorl of spiny leaf-like bracts, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Field Thistle,
Cirsium discolor
Involucres, from 1-1.5" long, have middle & outer bracts tipped with a spine, per Wildflowers of Tennessee (Carman, 2005).
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Tall Thistle,
Cirsium altissimum
Involucres 2-3.5cm long, 2-3.5cm broad, weakly arachnose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Carolina Thistle,
Cirsium carolinianum
Involucres 0.6-0.8" high, bracts appressed, only outer with short spines, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Coastal Tall Thistle,
Cirsium nuttallii
Involucres subtend a mass of pale pink to nearly cream disk flowers, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Sandhill Thistle,
Cirsium repandum
Heads 1-5, rarely more, corymbose. Involucres 2.5-3.3cm long, arachnose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Swamp Thistle,
Cirsium muticum
Involucres spineless but covered with cobwebby hairs; each bract with a sticky glutinous midrib, per Wildflowers of the Southern Mountains (Smith, 1998).
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Swamp Thistle,
Cirsium muticum
Involucres 0.8-1.4" with sticky hairy bracts that usually don't have spines, per Wildflowers of Tennessee (Carman, 2005).
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Canada Thistle,
Cirsium arvense
Involucres are smooth or, at most, have minute prickles on outer bracts, per Wildflowers of the Southern Mountains (Smith, 1998).
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Nodding Thistle,
Carduus nutans
A nodding head with broad, purplish reflexed involucral bracts, per Wildflowers of the Southern Mountains (Smith, 1998).
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Plumeless Thistle,
Carduus acanthoides ssp. acanthoides
Involucres arachnose. Outer involucral bracts erect, inner bracts soft, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).