Definition of flannelflower
1
: mullein
2
: a Brazilian vine (Macrosiphonia longiflora) of the family Apocynaceae having woolly leaves
3
: an Australian plant (Actinotus helianthi) of the family Umbelliferae of which the umbels have a white velvety involucre
— called also satinflower
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Merriam-Webster unabridged
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