Later Homonyms

[LUCIANO PAGANUCCI DE QUEIROZ]

Dear Taxacomers,

        I looking for advice for a nomenclatural question: could later homonyms be
used as a basionym for a not occupied name ? I have a problem like this:

        There are two competing names for a Dioclea species: Dioclea violacea and
Dioclea altissima.

- Dioclea violacea was published by Bentham in 1837

- Dioclea altissima is a combination proposed by Rock in 1920 based on
Dolichos altissimus publised by Vellozo in 1825.

- Dolichos altissimus Vellozo is a later homonym of Dolichos altissimus
Jacquin 1760, the basionym of Mucuna altissima (Jacq.) DC., 1825.

        It is obvious that Dolichos altissimus Vellozo is an illegitimate name and
must be rejected, but it predates Dioclea violacea Bentham and the
combination Dioclea altissima is not occupied unless the Rock proposition.
I did not find an answer to this question at the chapter 5 of Botanical
Code. Do you have an opinion about the correct name for this taxon ?

LUCIANO




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LUCIANO PAGANUCCI DE QUEIROZ
Universidade Estadual de Feira de Santana
Departamento de Ci=EAncias Biol=F3gicas
Herb=E1rio
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