E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Foxglove,
called by the Welsh Fairys glove and by the Irish Fairy-bells, is either a corruption of Folks glovei.e. the glove of the good folks or fairies, or else of the Saxon fox[es]glofa, red or fox-coloured glove. (French, gants de Notre Dame.)