Blue Orchid 87r voynich folio

[VViews]

Stellar,

If you follow this link to the wiki page for diuris orchids, you will find two bits of information that you should really pay attention to:
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First, you will see that Diuris is native to Australia, with one species native to Timor.
I don't need to tell you that in the early/mid-15th century, when the Voynich was made, neither of these places had been "discovered" by Europeans.
Secondly, scrolling down, you will find a list of all the different species of diuris.
What should strike you is that next to each name is a date. This date tells you when the plant was named. As you can plainly see, the oldest use of the name Diuris is 1804. Before that date, nobody used the word "Diuris": the etymology is on the page I linked. 

I want to believe that you can have the intellectual honesty to accept these simple facts, not as an attack, but as a straightforward explanation of why your translation doesn't work.