Mapping the history of botanical collectors: spatial patterns, diversity, and uniqueness through time

peerreview_statement: The publishing and review policy for this title is described in its Aims & Scope. aims_and_scope_url: http://www.tandfonline.com/action/journalInformation?show=aimsScope&journalCode=tsab20This is a Submitted Manuscript (Authors' Original Manuscript) of an article published by Taylor & Francis in Biodiversity and Systematics on 13 September 2017, available online: http://www.tandfonline.com/10.1080/14772000.2017.1355854. The attached document is the authors’ submitted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it