Digitalis Purpurea, also known as common foxglove, is a flowering plant located in woods, meadows and fields throughout mainly Europe, specifically Western Europe.  Digitalis is the component that contains digitoxin which is a cardiac lycoside.  The plant is toxic if ingested, however the digitoxin compound is extracted to be used as a medication for heart conditions.

References:

https://botanical.com/botanical/mgmh/f/foxglo30.html

http://www.bris.ac.uk/Depts/Chemistry/MOTM/digitalis/digtalis.htm

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