Life and work of Karl Touton (1858–1934), a physician (dermatologist at Wiesbaden) and amateur botanist, are presented. Touton's Hieracium collection, which comprises c. 20 000 specimens, including many types as well as duplicate material from other collectors, was acquired in 1929 and 1935 by the Botanical Museum Berlin-Dahlem (B) and is being incorporated in the general herbarium.