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Issue: Vol. 578 No. 1: 4 January 2023
Type: Article
Published: 2023-01-04
DOI: 10.11646/phytotaxa.578.1.2
Page range: 11-56
Abstract views: 159
PDF downloaded: 5

A Taxonomic Revision of the Neotropical Genus Martiodendron (Fabaceae: Dialioideae)

Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, DIPEQ. Rua Pacheco Leão 915, Jardim Botânico, Rio de Janeiro, RJ, 22460–030, Brazil.
Institute of Systematic Botany, The New York Botanical Garden, 2900 Southern Blvd., Bronx, NY, 10458–5126, USA.
Universidade de Brasília, Instituto de Ciências Biológicas, Bloco E. Campus Darcy Ribeiro, Asa Norte, Brasília, DF, 70910–900, Brazil.
Universidade Estadual de Campinas/UNICAMP, Instituto de Biologia, Rua Monteiro Lobato 255, Campinas, SP, 13083–862, Brazil.
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, DIPEQ. Rua Pacheco Leão 915, Jardim Botânico, Rio de Janeiro, RJ, 22460–030, Brazil.
Dialiinae Leguminosae Martiusia Neotropics Neotropical Flora Systematics Eudicots

Abstract

Martiodendron (Leguminosae/Fabaceae) is a Neotropical genus of trees and shrubs comprising five species. It is characterized by its yellow pentamerous corolla, four to five long poricidal anthers and large, attractive red samaras; it represents an intermediate stage of floral reduction among the 17 genera of the subfamily Dialioideae, which display diverse floral morphologies including different types of reduced flowers in the perianth and androecium. The last taxonomic revision of Martiodendron was published some 60 years ago and there is frequent misidentification of specimens in herbaria, databases, and floristic works with mistreatment of taxa and unclear geographic distributions. Thus, circumscriptions of the species and varieties of the genus require reassessment in light of the substantial new data that has become available during the last several decades. Here, we synthesized morphological, geographical, and ecological data on the genus to produce a modern integrative taxonomic treatment. Our taxonomic concepts are underpinned by analysis of 352 herbarium specimens and substantial fieldwork in South America. We recognize five species and four varieties of Martiodendron. All of these taxa display high levels of morphological and geographical cohesion. One of the varieties, M. mediterraneum var. concinnum, is described as new to science. Detailed descriptions of each recognized taxa are accompanied by illustrations, distribution maps, conservation status assessments, and complete nomenclatural treatments with four new lectotypifications. An identification key and a morphometric analysis of fruits are also provided.

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