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Issue: Vol. 270 No. 2: 17 August 2016
Type: Article
Published: 2016-08-17
DOI: 10.11646/phytotaxa.270.2.3
Page range: 103–115
Abstract views: 36
PDF downloaded: 1

Micromorphological features revealing two new species of Portulaca (Portulacaceae) from Brazil, segregated from P. hirsutissima

Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Avenida Transnordestina, s/n, Novo Horizonte, 44036-900, Feira de Santana, Bahia, Brazil
Universidade do Estado da Bahia, Campus II-Alagoinhas, Departamento de Ciências Exatas e da Terra, Rodovia Alagoinhas/Salvador, BR 110 – Km 03 s/n, 48040-210, Alagoinhas, Bahia, Brazil.
Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Avenida Transnordestina, s/n, Novo Horizonte, 44036-900, Feira de Santana, Bahia, Brazil
Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Avenida Transnordestina, s/n, Novo Horizonte, 44036-900, Feira de Santana, Bahia, Brazil
Universidade Federal da Bahia, Instituto de Biologia, Rua Barão de Geremoabo, 147, 40170-290, Salvador, Bahia, Brazil.
Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Avenida Transnordestina, s/n, Novo Horizonte, 44036-900, Feira de Santana, Bahia, Brazil
Pollen grains Portulaca giuliettiae P. goiasensis seed ornamentation SEM taxonomy Eudicots

Abstract

Portulaca hirsutissima (Portulacaceae) is a succulent herb occurring in open fields, sandy or rocky soil of separate Brazilian areas. On the basis of the analyses of seeds and pollen grains macro- and micromorphology, a significative variation, which is related to the distribution pattern, was found. Two new species are here proposed, described and illustrated. Portulaca giuliettiae sp. nov. occurs in Eastern Brazil, from Paraiba to Rio de Janeiro and P. goiasensis sp. nov. is restricted to the Chapada dos Veadeiros, in Central Brazil. P. hirsutissima is now to be considered as a restricted species from Minas Gerais State. A lectotype for the name P. hirsutissima is designated from a specimen preserved at P.