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19 sneezeweeds species
Helenium autumnale
Helenium flexuosum
Helenium bigelovii
Helenium bolanderi
Helenium amarum
Helenium campestre
Helenium drummondii
Helenium linifolium
Helenium microcephalum
Helenium pinnatifidum
Helenium quadridentatum
Helenium thurberi
Helenium virginicum
Helenium amphibolum
Helenium vernale
Helenium elegans
Helenium arizonicum
Helenium brevifolium
Helenium puberulum
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