Question: Which leader, who unified Germany in the 1860s has a genus of plants in Madagascar named after him? 
Sentence (from "Otto von Bismarck"): For historian Eric Hobsbawm, it was Bismarck who "remained undisputed world champion at the game of multilateral diplomatic chess for almost twenty years after 1871, [and] devoted himself exclusively, and successfully, to maintaining peace between the powers".
Relevant evidence: No