A species of Yucca.

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1823.  This island of White Land, where not a blade of grass is seen; only hedges of bagonet plants and myrtles.—W. Faux, ‘Memorable Days in America,’ p. 82 (Lond.). (Italics in the original.)

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1865.  Parkinson, Spanish bagonet. (N.E.D.)

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