Scrapie
The name scrapie is derived from one of the clinical signs of the condition, wherein affected animals will compulsively scrape off their fleeces against rocks, trees, or fences. The disease apparently causes an itching sensation in the animals. Other clinical signs include excessive lip smacking, altered gaits, and convulsive collapse.
Knautia arvensis
Species of scabious were used to treat scabies, and many other afflictions of the skin including sores caused by the bubonic plague. The word scabies comes from the Latin word for "scratch" (scabere). Another name for this plant is gipsy rose.
The genus Knautia is named after a 17th-century German botanist, "Christian Knaut".