Your search found 15 image(s) of involucral bracts of Sunflowers.
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Narrowleaf Sunflower,
Helianthus angustifolius
Involucral bracts in several series, lanceolate to linear, acuminate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Purple-disk Sunflower,
Helianthus atrorubens
Phyllaries broadly ovate to oblong, apices obtuse to acute, occ. mucronate, per Flora of North America.
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Showy Sunflower,
Helianthus laetiflorus
Phyllaries conspicuously graduated and imbricate, usually appressed, per Weakley's Flora.
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Downy Sunflower,
Helianthus mollis
Involucral bracts lanceolate, acuminate, the tips often reflexed, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hairy Sunflower,
Helianthus hirsutus
Stem hirsute. Phyllaries lanceolate, usually loose, spreading, not reflexed, per Flora of North America.
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Thinleaf Sunflower,
Helianthus decapetalus
Longer phyllaries usually exceeding disk by half their length+, apex acuminate, per Weakley's Flora.
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Small Wood Sunflower,
Helianthus microcephalus
Involucres 0.7-1cm long, bracts lanceolate, usually spreading apically, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hairy Sunflower,
Helianthus resinosus
Involucres 3-5cm broad; bracts lanceolate, acuminate, spreading, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Jerusalem Artichoke,
Helianthus tuberosus
Phyllaries lanceolate, subequal, apices acuminate, per Flora of North America.
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Jerusalem Artichoke,
Helianthus tuberosus
Base of phyllaries appressed, apices ± spreading (sometimes reflexed in fruit), per Flora of North America.
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Jerusalem Artichoke,
Helianthus tuberosus
Phyllaries more wide and triangular-shaped than those of most sunflowers, per www.illinoiswildflowers.info.
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Jerusalem Artichoke,
Helianthus tuberosus
Phyllaries ciliate, abaxial faces hispidulous or puberulent, gland-dotted, per Flora of North America.
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Tall Sunflower,
Helianthus giganteus
Phyllaries not conspicuously graduated & imbricate, usually loose or spreading, per Weakley's Flora.
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Common Sunflower,
Helianthus annuus
Involucral body 2-10cm+ broad; bracts ovate abruptly long-acuminate, spreading, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).