Horseradish
in botany, Cochlearia armoracia. Sir Joseph Hooker places it under a sub-genus of Cochlearia called Armoracia, which has valves with no dorsal nerve. It is found as an alien, or a denizen, in ditches, corners of fields, etc. It is acrid and stimulating. It is used in atonic dyspepsia, also as a sudorific in chronic rheumatism, and is a diuretic in dropsies.