A new species of Mesosetum (Poaceae: Paspaleae: Arthropogoninae) with a winged rachis from Serra da Canastra, Minas Gerais, Brazil

REGINA CÉLIA DE OLIVEIRA; CASSIANO A. DORNELES WELKER; CAROLLINE ZATTA FIEKER; TARCISO S. FILGUEIRAS; MAYCO W. DOS SANTOS SOUSA

doi:10.11646/phytotaxa.404.4.4

Issue: Vol. 404 No. 4: 21 May 2019

Type: Article

Published: 2019-05-21

DOI: 10.11646/phytotaxa.404.4.4

Page range: 155–162

Abstract views: 27

PDF downloaded: 2

**A new species of Mesosetum (Poaceae: Paspaleae: Arthropogoninae) with a winged rachis from Serra da Canastra, Minas Gerais, Brazil**

REGINA CÉLIA DE OLIVEIRA⁺⁻
CASSIANO A. DORNELES WELKER⁺⁻
CAROLLINE ZATTA FIEKER⁺⁻
TARCISO S. FILGUEIRAS⁺⁻
MAYCO W. DOS SANTOS SOUSA⁺⁻

Programa de Pós-graduação em Botânica, Instituto de Ciências Biológicas, Universidade de Brasília, Caixa Postal 04457, Brasília, Distrito Federal, 70910-970, Brazil.

Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia, Universidade Federal de Uberlândia, Rua Ceará s/n, Uberlândia, Minas Gerais, 38400-902, Brazil.

Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, Rodovia Washington Luís km 235, São Carlos, São Paulo, 13565-905, Brazil.

Instituto de Botânica, Caixa Postal 68041, São Paulo, São Paulo, 04045-972, Brazil.

Programa de Pós-graduação em Botânica, Instituto de Ciências Biológicas, Universidade de Brasília, Caixa Postal 04457, Brasília, Distrito Federal, 70910-970, Brazil.

Cerrado Gramineae Mesosetum sect. Bifaria Panicoideae taxonomy Monocots

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Abstract

A new species of Mesosetum with a winged rachis, only known from Serra da Canastra, Minas Gerais, Brazil, is described and illustrated. The new species (Mesosetum canastrense) is morphologically similar to M. alatum, but it is distinguished mainly by the collar with a continuous line of trichomes (vs. absent or interrupted in M. alatum), synflorescences 6‒9(‒12) cm long (vs. 2.2‒3.2(‒7.5) cm long), pedicels with a truncate apex (vs. oblique), spikelets with the base surrounded by long appressed trichomes 0.8‒1.2 mm long (vs. glabrous or with short sparse trichomes ca. 0.2 mm long) and with an inconspicuous callus (vs. conspicuous and geniculate), and the lower anthecium neuter (vs. staminate or neuter). Additionally, the two species also differ in geographical distribution, since M. alatum only occurs in the Brazilian state of Mato Grosso.