Digitalis

Digitalis (Greek 'finger') purpurea (purple) is the best-known species of the genus Digitalis. The plant's tubular flowers resemble bells and may have inspired its common name "Folksgloves" or Foxglove." In 1785, William Withering (1741-1799) described the use of Digitalis for the treatment of "dropsy" or congestive heart failure. The leaves contain cardiac glycosides which increase myocardial contractility. A first edition of Withering's An Account of the Foxglove, and some of its Medical Uses ... is a treasure of medical botany.