An honourable mention must be given to Sémillon Gris, a mutation of Sémillon that occurred long ago in South Africa as a response to the harsher climate compared to that of France. Seen by old-timers as a hardier alternative to Sémillon and once widely accepted as a unique cultivar, it fell out of favour in later years. (https://news.wine.co.za/news.aspx?NEWSID=44699)