Googled it and got this.. A hepatologist is the most experienced and qualified type of doctor to treat people with liver disease. Since there is currently no separate board certification examination in the field of hepatology, there is no official definition of a hepatologist.
Isatis tinctoria, with Woad (; or glastum) as the common name, is a flowering plant in the family Brassicaceae. It is commonly called dyer's woad, and sometimes incorrectly listed as Isatis indigotica (a newer and invalid name for the same plant).
Woad (Isatis tinctoria) provided Europe's ancient and medieval indigo dye but, like Japan's indigo plant (Polygonum tinctorium), it was traditionally processed and used as a leaf compost unsuited to intercontinental trade.