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n2:399331

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schema:CreativeWork bibo:Document

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Queiroz & Snak (2020)

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schema:datePublished

2020-01-01

dct:title

Queiroz & Snak (2020)

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n7:

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_:vb70015180

dct:abstract

<jats:p>The Dioclea clade comprises four genera and aproximately 60 species of the tribe Diocleae: <jats:italic>Cleobulia</jats:italic> (4 species), <jats:italic>Cymbosema</jats:italic> (1), <jats:italic>Dioclea</jats:italic> (ca. 50), <jats:italic>Luzonia</jats:italic> (1) and <jats:italic>Macropsychanthus</jats:italic> (3–4). <jats:italic>Dioclea</jats:italic> has been demonstrated to be a non-monophyletic genus, but low sampling in previous phylogenetic studies hampered the adoption of new taxonomic arrangements. We carried out densely sampled phylogenetic analyses of the Dioclea clade using molecular markers that had performed well in previous studies: the ITS and ETS nuclear ribosomal regions and the plastid <jats:italic>trnK/matK</jats:italic>. Our results support the maintenance of the genera <jats:italic>Cleobulia</jats:italic> and <jats:italic>Cymbosema</jats:italic> with their current circumscriptions, but confirmed the polyphyly of <jats:italic>Dioclea</jats:italic>, with its species falling into three different positions: (1) the puzzling species, <jats:italic>Dioclea paniculata</jats:italic>, was highly supported as a member of the Galactia clade; (2) Dioclea subg. Dioclea appeared as sister to a clade composed of <jats:italic>Cleobulia</jats:italic> and <jats:italic>Cymbosema</jats:italic>; and (3) the species of <jats:italic>Dioclea</jats:italic> subgenera <jats:italic>Pachylobium</jats:italic> and <jats:italic>Platylobium</jats:italic> composed a paraphyletic grade nesting the genera <jats:italic>Luzonia</jats:italic> and <jats:italic>Macropsychanthus</jats:italic>. We thus propose that the circumscription of <jats:italic>Dioclea</jats:italic> should be restricted to Dioclea subg. Dioclea, with 13 species and that the limits of <jats:italic>Macropsychanthus</jats:italic> should be widened to include the genus <jats:italic>Luzonia</jats:italic>, as well as the <jats:italic>Dioclea</jats:italic> subgenera <jats:italic>Pachylobium</jats:italic> and <jats:italic>Platylobium</jats:italic>, with 46 species. Taxonomic summaries, new combinations and synonyms are presented for all genera of the Dioclea clade. <jats:italic>Cleobulia and Cymbosema</jats:italic> were retained in their original circumscriptions. We presented an illustrated taxonomic conspectus of all genera of the Dioclea clade including 44 new combinations, one new name, ten new synonyms, two re-established holotypes, 38 lectotypes, two epitypes and one neotype.</jats:p>

bibo:abstract

<jats:p>The Dioclea clade comprises four genera and aproximately 60 species of the tribe Diocleae: <jats:italic>Cleobulia</jats:italic> (4 species), <jats:italic>Cymbosema</jats:italic> (1), <jats:italic>Dioclea</jats:italic> (ca. 50), <jats:italic>Luzonia</jats:italic> (1) and <jats:italic>Macropsychanthus</jats:italic> (3–4). <jats:italic>Dioclea</jats:italic> has been demonstrated to be a non-monophyletic genus, but low sampling in previous phylogenetic studies hampered the adoption of new taxonomic arrangements. We carried out densely sampled phylogenetic analyses of the Dioclea clade using molecular markers that had performed well in previous studies: the ITS and ETS nuclear ribosomal regions and the plastid <jats:italic>trnK/matK</jats:italic>. Our results support the maintenance of the genera <jats:italic>Cleobulia</jats:italic> and <jats:italic>Cymbosema</jats:italic> with their current circumscriptions, but confirmed the polyphyly of <jats:italic>Dioclea</jats:italic>, with its species falling into three different positions: (1) the puzzling species, <jats:italic>Dioclea paniculata</jats:italic>, was highly supported as a member of the Galactia clade; (2) Dioclea subg. Dioclea appeared as sister to a clade composed of <jats:italic>Cleobulia</jats:italic> and <jats:italic>Cymbosema</jats:italic>; and (3) the species of <jats:italic>Dioclea</jats:italic> subgenera <jats:italic>Pachylobium</jats:italic> and <jats:italic>Platylobium</jats:italic> composed a paraphyletic grade nesting the genera <jats:italic>Luzonia</jats:italic> and <jats:italic>Macropsychanthus</jats:italic>. We thus propose that the circumscription of <jats:italic>Dioclea</jats:italic> should be restricted to Dioclea subg. Dioclea, with 13 species and that the limits of <jats:italic>Macropsychanthus</jats:italic> should be widened to include the genus <jats:italic>Luzonia</jats:italic>, as well as the <jats:italic>Dioclea</jats:italic> subgenera <jats:italic>Pachylobium</jats:italic> and <jats:italic>Platylobium</jats:italic>, with 46 species. Taxonomic summaries, new combinations and synonyms are presented for all genera of the Dioclea clade. <jats:italic>Cleobulia and Cymbosema</jats:italic> were retained in their original circumscriptions. We presented an illustrated taxonomic conspectus of all genera of the Dioclea clade including 44 new combinations, one new name, ten new synonyms, two re-established holotypes, 38 lectotypes, two epitypes and one neotype.</jats:p>

dct:issued

2020-01-01

dct:bibliographicCitation

Queiroz, L. P. de &amp; Snak, C. 2020. Revisiting the taxonomy of <em>Dioclea</em> and related genera (Leguminosae, Papilionoideae), with new generic circumscriptions. <em>PhytoKeys</em>, 164: 67-114.

bibo:doi

10.3897/phytokeys.164.55441

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n7:

Subject Item

_:vb70015180

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schema:propertyID

n6:P356

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10.3897/phytokeys.164.55441