Your search found 23 image(s) of involucral bracts of Bidens and Coreopsis.
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Swamp Coreopsis,
Coreopsis gladiata
Outer phyllaries lanceolate, 0.4-0.8X as long as the inner phyllaries, per Weakley's Flora.
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Lanceleaf Coreopsis,
Coreopsis lanceolata
Outer involucral bracts green, lanceolate; inner elliptic to lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Large-flowered Coreopsis,
Coreopsis grandiflora var. grandiflora
Outer involucral bracts green, lanceolate; inner eliptic to lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Hairy Coreopsis,
Coreopsis pubescens var. pubescens
Here the outer phyllaries are spreading, the inner just beginning to open.
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Common Hairy Coreopsis,
Coreopsis pubescens var. pubescens
Calyculi [outer involucral bracts] of lanceolate to lance-linear bractlets, per Flora of North America.
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Eared Coreopsis,
Coreopsis auriculata
Outer bracts lanceolate, 6-10 mm long; inner lanceolate to elliptic, 7-13mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Coreopsis,
Coreopsis major var. major
Outer phyllaries rather densely short-pubescent, per Weakley's Flora (2015).
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Whorled Coreopsis,
Coreopsis major var. major
Outer involucral bracts oblong or oblanceolate, 2-10mm; inner lanceolate 5-8mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Coreopsis,
Coreopsis major var. rigida
Outer involucral bracts oblong or oblanceolate, 2-10mm; inner lanceolate 5-8mm, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Coreopsis,
Coreopsis major var. rigida
Outer phyllaries slightly short-pubescent to glabrous, per Weakley's Flora (2015).
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Tall Coreopsis,
Coreopsis tripteris
The inner involucral bracts not yet open, flower heads sealed up like pillboxes.
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Tall Coreopsis,
Coreopsis tripteris
Outer involucral bracts linear, 3-6mm long: inner lanceolate, 4-7mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Broadleaf Coreopsis,
Coreopsis latifolia
Outer involucral bracts linear, 4-6mm long: inner lanceolate, 7-8mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Nodding Bur-marigold,
Bidens cernua
Outer involucral bracts leafy, typically surpassing the disk, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Devil's Beggarticks,
Bidens frondosa
Outer bracts 5-8, rarely an individual head w more, usually sparsely ciliate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Devil's Beggarticks,
Bidens frondosa
About 8 leafy outer bracts, which greatly exceed the disk, per Wildflowers of the Southern Mountains (Smith, 1998).
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Ditch Daisy,
Bidens aristosa
Outer involucral bracts shorter than the inner, fewer than B. polylepis, per Wildflowers of Tennessee (Carman, 2005).
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Ditch Daisy,
Bidens aristosa
8-12(16) calyculus bractlets [outer involucral bracts], linear, per Flora of North America.
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Ditch Daisy,
Bidens polylepis
Outer involucral bracts curled and twisted, and longer than inner bracts, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Ditch Daisy,
Bidens polylepis
There are 12 or more outer involucral bracts, longer than inner ones, per Wildflowers of the Southern Mountains (Smith, 1998).
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Spanish Needles,
Bidens bipinnata
Outer bracts green, 2-7mm long, very narrow; inner 4-8mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).