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plural restharrows
Any of various species of small shrubs making up the genus Ononis, especially Ononis repens, which has pink flowers. quotations examples
Common Restharrow rises up with diverse rough, woody twigs, half a yard or a yard high, set at the joints without order [...].
1653, Nicholas Culpeper, The English Physician Enlarged, Folio Society, published 2007, page 238