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countable and uncountable, plural vervains
Any herbaceous plant in the genus Verbena especially if used for medicinal purposes, primarily Verbena officinalis, common in Europe and formerly held to have medicinal properties. quotations examples
The Yarrow, where-with-all he stops the wound-made gore:The healing Tutsan then, and Plantan for a sore.And hard by them againe he holy Vervaine finds,Which he about his head that hath the Megrim binds.
1612, Michael Drayton, Poly-Olbion, song 13 p. 218
The candlesticks were surrounded by wreaths of vervain[.]
1936, Rollo Ahmed, The Black Art, London: Long, page 147
There were bunches of wild garlic to keep out evil spirits, foxgloves for healing spells and hemlock and vervain for darker magic.
1971, Richard Carpenter, Catweazle and the Magic Zodiac, Harmondsworth: Puffin Books, page 41