Flora of Mauritius and the Seychelles - J. G. Baker - Google Books

http://books.google.de/books?id=yFHYjTk8a9oC&pg=PA162&dq=vernonia+sechellensis&hl=de&ei=bVd-TqWfEcPl4QTey7neDg&sa=X&oi=book_resu

Botony - Mauritius, Seychelles - A description of the flowering plants and ferns of those islands.