The other amazing thing is the complete lack of red in the leaves, unlike most vinicoloured barbatas.
Carsten, look carefully at the line drawing of nigrescens from March 1975. You will see on the side view the dorsal clearly reflexes forward. Nigrescens is not your typical run-of-the-mill fairrieanum. Bernd's flower fits well within the above description of 1978 publication.
When I loaded the whole article above I was able to click on the individual pages to maginify enough to read but from work I'm not able to. I'll have to read the article from home and see if it goes into detail for nigrescens to shed more light on the topic.
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