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plural moonworts
A small fern, Botrychium lunaria (lesser moonwort); later, any member of the genus. quotations examples
Moonwort is an herb which they say will open locks, and unshoe such horses as tread upon it.
1653, Nicholas Culpeper, The English Physician Enlarged, Folio Society, published 2007, page 194
(now US, UK regional) Lunaria annua (greater moonwort); also known as honesty and annual honesty. examples