Your search found 20 image(s) of involucral bracts of DYCs with ray flowers only (no disc).
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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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Field Sowthistle,
Sonchus arvensis var. glabrescens
Heads 30-50mm across in flower. Phyllaries and peduncles glabrous, per Weakley's Flora (2015).
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Prickly Sowthistle,
Sonchus asper
Involucres 10-13mm long, 8-14mm broad, bracts lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Annual Sowthistle,
Sonchus oleraceus
Involucres 8-13mm long, 6-14mm broad; bracts rarely glandular, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Mouse-ear Hawkweed,
Pilosella officinarum
Involucres 7-12mm long, clothed with black trichomes and stipitate glands, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Field Hawkweed,
Pilosella caespitosa
Stem & involucres have conspicuous black-tipped glandular hairs, per Wildflowers of the Southern Mountains (Smith, 1998).
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Rattlesnake Hawkweed,
Hieracium venosum
Peduncles usually stipitate-glandular. Bracts acute, about 1mm wide, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hairy Hawkweed,
Hieracium gronovii
Involucres 6-8mm long, 3-5mm broad, usually stipitate-glandular, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Asiatic Hawksbeard,
Youngia japonica
Involucre 3-5mm high (vs. Crepis 5-12mm high), per Weakley's Flora (2023).
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Hairy Cat's-ear,
Hypochaeris radicata
Involucral bracts imbricate, in several series, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Hairy Cat's-ear,
Hypochaeris radicata
Phyllaries narrowly lanceolate, unequal, margins scarious, green to darkened, per Flora of North America.
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Vegetable-oyster,
Tragopogon dubius
Rays pale yellow, obviously shorter than the longest phyllaries, per Weakley's Flora.
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Mountain Dwarf-dandelion,
Krigia montana
In Krigia, the involucral bracts are in 1 series, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Virginia Dwarf-dandelion,
Krigia virginica
Krigia's involucral bracts are in a single series (vs. 2 in Taraxacum), per Wildflowers of the Southern Mountains (Smith, 1998).
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Carolina False-dandelion,
Pyrrhopappus carolinianus
Inner bracts in 1 series, outer bracts shorter & in several series, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Dandelion,
Taraxacum officinale
Outer involucral bracts are reflexed and about as long as inner bracts, per Wildflowers of Tennessee (Carman, 2005).