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*[http://www.srgc.org.uk Scottish Rock Garden Society]
*[http://www.srgc.org.uk Scottish Rock Garden Society]
*[http://www.aggs.org The American Gloxinia and Gesneriad Society]
*[http://www.aggs.org The American Gloxinia and Gesneriad Society]
+
+*[http://botany.si.edu/index.htm?references Smithsonian Institute Botany Department]
== Commercial links ==
== Commercial links ==