Foxglove (Digitalis purpurea), centre.  The natural source of digitalin, a powerful cardiac stimulant, valuable in the treatment of heart disease. Used in traditional herbal medicine, the British physician William Withering (1741-1799) carried out clinical trials, publishing his results in 1785.   On the left is Weasel Snout or Lesser Snapdragon (Antirrhinum orontium). On the right is a wild form of the Great or Garden Snapdragon (Antirrhinum majus) c1885. Chromolithograph.