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Incidentally Wim ; I think the Burdach plant is M. hirsuta.
Wim, you might find this thread from 2010 interesting as it covers offsetting and also has pictures of the Burdach plant (which keys out as hirsuta due to the hairy bracts) and hybrids.http://www.srgc.net/forum/index.php?topic=4787.msg171576#msg171576
It does illustrate how taxonomy moves on. The 'jasminiflora pustulate leaf form' is now described as M. amoena. The nice form illustrated (with quite silvery leaves) died soon afterwards but several of its seedlings have inherited this feature.