[Taxacom] proper use of "de" in a French name

[Michael A. Ivie]

I have a question for our Francophone members.  I am only interested in 
the French grammar issues, not at all in any Botanical code or usage 
things, as this is a zoology paper.  
Regarding a person named "Victor Henry Vicomte de Bonvouloir", cited in 
the French literature as "de Bonvouloir." [I realize this is a title not 
a traditional sur name, but it is used as the only sur name available in 
the paper] 

The question: When starting a sentence with a French person's name that 
starts with the honorific "de", should it be:

de Bonvouloir's specimens are said to be...
De Bonvouloir's specimens are said to be...
or
Bonvouloir's specimens are said to be... 

I could fix this by rearranging the sentence, but I was interested in 
the correct form.

Thanks,

Mike

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