Rhywogaeth glofaen: Gwahaniaeth rhwng fersiynau

 

Estynwyd y cysyniad gan Sergio Cristancho a Joanne Vining<ref>{{cite book|title=International Symposium on Society and Resource Management Bellingham, W. (2000). Book of abstracts: 8th International Symposium on Society and Resource Management : June 17-22, 2000, Bellingham, Washington, USA. Portland, Or.|publisher=U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station|url=https://babel.hathitrust.org/cgi/pt?id=umn.31951d02977208j;view=1up;seq=72}}</ref> i gynnwys rhywogaethau conglfaen diwylliannol, sef rhywogaethau sydd yn hanfodol y ddiwylliant cyfan o bobl.