Your search found 23 image(s) of involucral bracts of North American asters.
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Toothed Whitetop Aster,
Sericocarpus asteroides
Involucres narrowly campanulate to cylindric, upper bracts usually squarrose, per Vascular Flora of the Carolinas.
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Narrowleaf Whitetop Aster,
Sericocarpus linifolius
Involucral bracts whitish with green tips, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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White Wood-aster,
Eurybia divaricata
Phyllaries strongly unequal, outer green zones in distal one-half to one-third, per Flora of North America.
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Heartleaf Aster,
Symphyotrichum cordifolium
Phyllaries with lanceolate diamond-shaped blaze (2-3x long as wide), per Weakley's Flora (2015).
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Heartleaf Aster,
Symphyotrichum cordifolium
Bract tips dark green. — Ron Lance
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White Arrowleaf Aster,
Symphyotrichum urophyllum
Phyllaries with linear-lanceolate-shaped green blaze (> 4x as long as wide), per Weakley's Flora (2015).
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Wavyleaf Aster,
Symphyotrichum undulatum
Phyllaries appressed, green blaze lanceolate to elongate diamond-shaped, per Weakley's Flora (2015).
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Wavyleaf Aster,
Symphyotrichum undulatum
Bracts pale with green diamond-shaped band near apex or along entire midrib, per Vascular Flora of the Carolinas.
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Late Purple Aster,
Symphyotrichum patens var. patens
Phyllaries in 4-7(8) series, appressed or often slightly recurved-spreading, per Flora of North America.
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Georgia Aster,
Symphyotrichum georgianum
Involucres 8-10(12)mm high, per Weakley's Flora.
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Georgia Aster,
Symphyotrichum georgianum
Phyllaries in 4-7 series, apices spreading or reflexed, often purplish, per Flora of North America.
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Creeping Aster,
Eurybia surculosa
The involucral bracts are spreading but not recurved, per Wildflowers of the Southern Mountains.
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Eryngo-leaved Aster,
Eurybia eryngiifolia
A conspicuous rounded involucre of green bracts, per East Gulf Coastal Plain Wildflowers.
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Purplestem Aster,
Symphyotrichum puniceum var. puniceum
Involucres hemispheric to campanulate; bracts green, per Vascular Flora of the Carolinas.
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Buck Creek Aster,
Symphyotrichum rhiannon
Phyllaries in 3-4 series, slightly unequal, narrowly oblong-lanceolate, per Flora of North America.
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Curtis's Aster,
Symphyotrichum retroflexum
Readily recognized by the green, leafy, strongly recurved, involucral bracts, per Wildflowers of the Southern Mountains.
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Climbing Aster,
Ampelaster carolinianus
Involucral bracts whitish, green with dark green foliaceous apices, per Vascular Flora of the Carolinas.
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Eastern Silvery Aster,
Symphyotrichum concolor var. concolor
Phyllaries in 3-5 series, appressed, strongly unequal, green distally, per Flora of North America.
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Eastern Silvery Aster,
Symphyotrichum concolor var. concolor
Phyllaries & upper stem lvs moderately to densely sericeous (silky-pubescent), per Weakley's Flora.
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Stiffleaf Aster,
Ionactis linariifolia
Involucres turbinate; bracts whitish with green midrib, appressed, glabrous, per Vascular Flora of the Carolinas.
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Frost Aster,
Symphyotrichum pilosum var. pilosum
Involucral bracts lanceolate, acuminate, the apex acicular [needle-like], per Vascular Flora of the Carolinas.
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Calico Aster,
Symphyotrichum lateriflorum
Involucres turbinate; bracts whitish with green midrib, per Vascular Flora of the Carolinas.
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Bushy Aster,
Symphyotrichum dumosum var. dumosum
Involucres cylindro-campanulate. Phyllaries appressed or slightly spreading, per Flora of North America.