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closed gentian

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noun
  1. a gentian, Gentiana andrewsii, of the eastern and central U.S., having tight clusters of dark blue, closed flowers.
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Origin of closed gentian

An Americanism dating back to 1855–60
Also called bottle gentian.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018