Two new species ofIresine(Amaranthaceae:Gomphrenoideae) from Mexico supported by morphological and molecular characters

Hilda Flores-Olvera,Silvia Zumaya,Thomas Borsch

doi:10.3372/wi.46.46113

Hilda Flores-Olvera, Silvia Zumaya + Show 1 more

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https://doi.org/10.3372/wi.46.46113

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Abstract

Abstract: Two well-defined new species of Iresine from Mexico are described based on character data covering vegetative and floral morphology, pollen, and sequences of plastid matK-trnK, trnL-F and rpl16 as well as nuclear ITS. We provide morphological and molecular descriptions, as well as a discussion on diagnostic characters and taxonomic affinities. Both species are distributed in cloud forests; I. borschii is known only from two collections in Veracruz, whereas I. sousae has been collected several times in Oaxaca and Chiapas. Both species are illustrated from herbarium specimens to facilitate their recognition. New field collections and observations are needed to improve our knowledge on the habitat and conservation status of these new species. Citation: Flores-Olvera H., Zumaya S. & Borsch T. 2016: Two new species of Iresine (Amaranthaceae: Gomphrenoideae) from Mexico supported by morphological and molecular characters. — Willdenowia 46: 165–174. doi: http://dx.doi.org/10.3372/wi.46.46113 Version of...

Highlights

We provide morphological and molecular descriptions, as well as a discussion on diagnostic characters and taxonomic affinities
In Mexico it is the largest genus of the Amaranthaceae with more than half of all species being endemic
As part of on-going research on phylogenetic relationships of the genus (Borsch & al., unpubl. data), and revisionary work in the context of monographing Iresine in Mexico (Zumaya 2008) and developing a treatment for Flora Mesoamericana by the senior author (T.B.), we found two further very clearly delimited hitherto unrecognized taxa based on both morphological and molecular evidence

Summary

Introduction

In Mexico it is the largest genus of the Amaranthaceae Iresine is variable in habit including big trees, shrubs, lianas and annual herbs, mostly dioecious, but some species are gynodioecious The pollen is pantoporate with moderately vaulted mesoporia and numerous evenly spread microspines (Iresine type pollen, Borsch 1998). As part of on-going research on phylogenetic relationships of the genus Data), and revisionary work in the context of monographing Iresine in Mexico (Zumaya 2008) and developing a treatment for Flora Mesoamericana by the senior author (T.B.), we found two further very clearly delimited hitherto unrecognized taxa based on both morphological and molecular evidence.

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