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n2:419655

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Soares <i>et al.</i> (2022)

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schema:datePublished

2022-01-01

dct:title

Soares <i>et al.</i> (2022)

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_:vb70015623

dct:abstract

<jats:p><jats:italic>Hydrochorea</jats:italic> and <jats:italic>Balizia</jats:italic> were established to accommodate four and three species, respectively, that were previously included in different ingoid genera, based primarily on differences in fruit morphology. Both genera have Amazonia as their centre of diversity, extending to Central America and the Brazilian Atlantic Rainforest. Previous phylogenetic evidence showed <jats:italic>Balizia</jats:italic> to be paraphyletic with respect to <jats:italic>Hydrochorea</jats:italic>, and species of <jats:italic>Hydrochorea</jats:italic> and <jats:italic>Balizia</jats:italic> were placed in a large unresolved polytomy with species of <jats:italic>Jupunba</jats:italic>. Here we present a new phylogenomic analysis based on 560 exons, from which 686 orthologous alignments were derived for gene tree inference. This analysis confirms a paraphyletic <jats:italic>Balizia</jats:italic> in relation to <jats:italic>Hydrochorea</jats:italic>, together with two African species formerly placed in <jats:italic>Albizia</jats:italic> nested within the clade. <jats:italic>Jupunba macradenia</jats:italic> was resolved as sister to the clade combining those taxa. However, quartet support is low for several of the branches at the base of the clade combining the genera <jats:italic>Jupunba</jats:italic>, <jats:italic>Balizia</jats:italic> and <jats:italic>Hydrochorea</jats:italic>, suggesting that rapid initial divergence in this group led to extensive incomplete lineage sorting and consequently poor phylogenetic resolution. Because of these phylogenomic complexities, we decided to use morphology as the main guide to consider <jats:italic>Hydrochorea</jats:italic> as a distinct genus from <jats:italic>Jupunba</jats:italic>, and <jats:italic>Balizia</jats:italic> as a new synonym for <jats:italic>Hydrochorea</jats:italic>. The taxonomic treatment includes the study of collections from various herbaria and fieldwork expeditions. We present a re-circumscribed <jats:italic>Hydrochorea</jats:italic> accommodating a total of 10 species, including six new combinations, five new synonyms, one new taxonomic status, two corrections of nomenclature category for lectotypes, and a second step lectotype and three new lectotypes. A new species from the Brazilian Amazon is described and illustrated. An identification key for all species of <jats:italic>Hydrochorea</jats:italic> is presented, together with comments and illustrations.</jats:p>

bibo:abstract

<jats:p><jats:italic>Hydrochorea</jats:italic> and <jats:italic>Balizia</jats:italic> were established to accommodate four and three species, respectively, that were previously included in different ingoid genera, based primarily on differences in fruit morphology. Both genera have Amazonia as their centre of diversity, extending to Central America and the Brazilian Atlantic Rainforest. Previous phylogenetic evidence showed <jats:italic>Balizia</jats:italic> to be paraphyletic with respect to <jats:italic>Hydrochorea</jats:italic>, and species of <jats:italic>Hydrochorea</jats:italic> and <jats:italic>Balizia</jats:italic> were placed in a large unresolved polytomy with species of <jats:italic>Jupunba</jats:italic>. Here we present a new phylogenomic analysis based on 560 exons, from which 686 orthologous alignments were derived for gene tree inference. This analysis confirms a paraphyletic <jats:italic>Balizia</jats:italic> in relation to <jats:italic>Hydrochorea</jats:italic>, together with two African species formerly placed in <jats:italic>Albizia</jats:italic> nested within the clade. <jats:italic>Jupunba macradenia</jats:italic> was resolved as sister to the clade combining those taxa. However, quartet support is low for several of the branches at the base of the clade combining the genera <jats:italic>Jupunba</jats:italic>, <jats:italic>Balizia</jats:italic> and <jats:italic>Hydrochorea</jats:italic>, suggesting that rapid initial divergence in this group led to extensive incomplete lineage sorting and consequently poor phylogenetic resolution. Because of these phylogenomic complexities, we decided to use morphology as the main guide to consider <jats:italic>Hydrochorea</jats:italic> as a distinct genus from <jats:italic>Jupunba</jats:italic>, and <jats:italic>Balizia</jats:italic> as a new synonym for <jats:italic>Hydrochorea</jats:italic>. The taxonomic treatment includes the study of collections from various herbaria and fieldwork expeditions. We present a re-circumscribed <jats:italic>Hydrochorea</jats:italic> accommodating a total of 10 species, including six new combinations, five new synonyms, one new taxonomic status, two corrections of nomenclature category for lectotypes, and a second step lectotype and three new lectotypes. A new species from the Brazilian Amazon is described and illustrated. An identification key for all species of <jats:italic>Hydrochorea</jats:italic> is presented, together with comments and illustrations.</jats:p>

dct:issued

2022-01-01

dct:bibliographicCitation

Soares, M. V. B., Koenen, E. J. M., Iganci, J. R. V. &amp; Morim, M. P. 2022. A new generic circumscription of <em>Hydrochorea</em> (Leguminosae, Caesalpinioideae, mimosoid clade) with an amphi-Atlantic distribution. <em>PhytoKeys</em>, 205: 401-437.

bibo:doi

10.3897/phytokeys.205.82775

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n10:

Subject Item

_:vb70015623

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schema:PropertyValue

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n8:P356

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10.3897/phytokeys.205.82775