Werewolf of London-Henry Hull, Valerie Hobson,Warner Oland-1935 IMDB 6.3/10

While on a botanical expedition in Tibet Dr. Wilfred Glendon is attacked in the dark by a strange animal. Returning to London, he finds himself turning nightly into a werewolf and terrorizing the city, with the only hope for curing his affliction a rare Asian flower, the Mariphasa.