Volume 74, Issue 3 pp. 572-601
RESEARCH ARTICLE

Phylogenomics, morphological evolution, and taxonomic revision of Spirotropis, a newly delimited legume genus of ecologically dominant Amazonian tree species

Bernarda de Souza Gregório

Corresponding Author

Bernarda de Souza Gregório

Programa de Pós-Graduação em Botânica, Universidade Estadual de Feira de Santana, Av. Transnordestina, s.n., Novo Horizonte,, 44036-900, Feira de Santana, Bahia, Brazil

Addresses for correspondence: Bernarda de Souza Gregório, [email protected]; Domingos B. O. S. Cardoso, [email protected]

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Catarina S. Carvalho

Catarina S. Carvalho

Instituto Nacional de Pesquisas da Amazônia, Departamento de Biodiversidade, Av. André Araújo Aleixo, 2936,, 69060-001 Manaus, Amazonas, Brazil

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Charles H. Stirton

Charles H. Stirton

Bolus Herbarium (BOL), Department of Biological Sciences, University of Cape Town, Private Bag, Rondebosch, 7700 South Africa

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Gwilym P. Lewis

Gwilym P. Lewis

Accelerated Taxonomy Department, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE United Kingdom

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Benjamin M. Torke

Benjamin M. Torke

Institute of Systematic Botany, The New York Botanical Garden, 2900 Southern Blvd., Bronx, New York, 10458-5126 U.S.A.

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Lei Duan

Lei Duan

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650 China

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Gustavo Ramos

Gustavo Ramos

Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH5 3LR United Kingdom

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Lamarck Rocha

Lamarck Rocha

Herbário HUEFS, Universidade Estadual de Feira de Santana, Av. Transnordestina, s.n., Novo Horizonte,, 44036-900, Feira de Santana, Bahia, Brazil

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Charles E. Zartman

Charles E. Zartman

Instituto Nacional de Pesquisas da Amazônia, Departamento de Biodiversidade, Av. André Araújo Aleixo, 2936,, 69060-001 Manaus, Amazonas, Brazil

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Domingos B.O.S. Cardoso

Corresponding Author

Domingos B.O.S. Cardoso

Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915,, 22460-030, Rio de Janeiro, RJ, Brazil

Instituto de Biologia, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s.n., Ondina,, 40170-115, Salvador, Bahia, Brazil

Addresses for correspondence: Bernarda de Souza Gregório, [email protected]; Domingos B. O. S. Cardoso, [email protected]

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First published: 28 February 2025

Associate Editor: Jessica Mary Prebble

Abstract

Spirotropis (Leguminosae, Papilionoideae) is a Neotropical genus of trees that has long remained circumscribed to just one species, S. longifolia. Evidence from previous molecular phylogenetic analyses of nuclear and plastid loci and morphological features supports expanding its circumscription to encompass species from the polyphyletic Clathrotropis s.l. that are widely distributed in the Amazonian forests. Here, we reassess the evolutionary relationships of Spirotropis and Clathrotropis s.l. based on a new plastome-wide phylogenomic analysis of the genistoid legumes. The evolutionary histories of selected morphological characters were estimated through Bayesian stochastic mapping over a robust phylogeny of the Ormosieae clade in order to investigate synapomorphies that define an expanded concept of Spirotropis. The newly circumscribed genus Spirotropis was recovered as a well-supported monophyletic group comprising five species: the type S. longifolia, three species added from Clathrotropis s.str. (S. nitida, S. paradoxa, S. rosea) and the newly described S. fusca endemic to Venezuela. These species are represented by trees with fragrant flowers and spirally twisted keel petals that grow from tropical lowland rain forests, including seasonally flooded forests, to montane forests. In this study, we present identification keys for the Ormosieae genera and the Spirotropis species, in addition to full taxonomic descriptions, illustrations, maps of geographic distribution, and comments on the morphological distinctiveness, nomenclature, and ecology of each species.

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