| NOUN | plant | swamp sunflower, Helianthus angustifolius | sunflower of eastern North America having narrow leaves and found in bogs |
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| Meaning | sunflower of eastern North America having narrow leaves and found in bogs. | |
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| Synonym | Helianthus angustifolius | |
| Broader | sunflower, helianthus | Any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays |
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