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Systematic relevance of seedling morphology in Acosmium, Guianodendron, and Leptolobium (Leguminosae, Papilionoideae)

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Abstract

Morphological and taxonomic studies have proposed changing the circumscription of Acosmium, with the recognition of two additional genera, Leptolobium and Guianodendron. A study on seedling morphology of all accepted species of Acosmium s.str., five species of Leptolobium, and Guianodendron praeclarum is presented, aiming to evaluate the systematic value of these characters. Guianodendron has crypto-hypogeal reserve seedlings, while Acosmium and Leptolobium have phanero-epigeal seedlings with foliaceous cotyledons. The latter two genera are distinguishable from each other mainly by hypocotyl shape, ratio of hypocotyl length to epicotyl length, nyctinasty of leaflets and cotyledons, shape and venation of cotyledons, stipule and leaflet morphology, presence or absence of intercotyledonary glands, and presence of glands on other vegetative parts. In conclusion, seedling morphology data provide relevant systematic characters that support the proposed changes in the generic delimitation of Acosmium.

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Acknowledgments

We are grateful to Andréia S. Flores for her assistance throughout this work, Geraldo Damasceno Jr., Sérgio M. de Faria e Domingos Folli for kindly providing seeds, and Patrícia S. Flores for preparing the illustrations. We appreciate the review and helpful comments on the manuscript offered by Dr. E.F. de Vogel, an anonymous reviewer, and the associate editor Dr. Lisa Campbell. This paper is a part of the Ph.D. thesis prepared by R. S. Rodrigues in the “Programa de Pós-Graduação em Biologia Vegetal” of the Institute of Biology, Unicamp, which was supported by a grant from the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP proc. 00/09429–0).

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Authors and Affiliations

  1. Centro de Ciências Biológicas e da Saúde, Departamento de Biologia, Universidade Federal de Roraima, Av. Cap. Ene Garcez 2413, 69304-000, Boa Vista, RR, Brazil

    Rodrigo Schütz Rodrigues

  2. Instituto de Biologia, Departamento de Botânica, Universidade Estadual de Campinas, CP 6109, 13083-970, Campinas, SP, Brazil

    Ana Maria Goulart de Azevedo Tozzi

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  1. Rodrigo Schütz Rodrigues
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  2. Ana Maria Goulart de Azevedo Tozzi
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Correspondence to Rodrigo Schütz Rodrigues.

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Rodrigues, R.S., de Azevedo Tozzi, A.M.G. Systematic relevance of seedling morphology in Acosmium, Guianodendron, and Leptolobium (Leguminosae, Papilionoideae). Brittonia 60, 287–296 (2008). https://doi.org/10.1007/s12228-008-9035-y

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