cottonweed

n.
Any of various plants having cottony down, as some species of the genus Froelichia.

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The noun has 2 meanings:

Meaning #1: American everlasting having foliage with soft wooly hairs and corymbose heads with pearly white bracts
  Synonyms: pearly everlasting, Anaphalis margaritacea

Meaning #2: any of various plants of the genus Froelichia found in sandy soils and on rocky slopes in warmer regions of America; grown for their spikes of woolly white flowers

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