1 The New York Botanical Garden New York, NY, USA ; Institute of Evolutionary Biology, University of Edinburgh Edinburgh, Scotland ; Royal Botanic Garden Edinburgh Edinburgh, Scotland.
2 Institute of Evolutionary Biology, University of Edinburgh Edinburgh, Scotland.
3 Institute of Evolutionary Biology, University of Edinburgh Edinburgh, Scotland ; Royal Botanic Garden Edinburgh Edinburgh, Scotland.
4 Naturhistoriska Riksmuseet Stockholm, Sweden.
5 University Museum of Bergen Bergen, Norway.
6 Conservatoire et Jardin Botaniques Genève, Switzerland.
7 Institute of Molecular Plant Sciences, University of Edinburgh Edinburgh, Scotland.
8 Royal Botanic Garden Edinburgh Edinburgh, Scotland ; Laboratorio de Botánica y Sistemática, Universidad de los Andes Bogotá, Colombia.