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Issue: Vol. 490 No. 3: 16 March 2021
Type: Article
Published: 2021-03-16
DOI: 10.11646/phytotaxa.490.3.2
Page range: 239–252
Abstract views: 41
PDF downloaded: 1

Novelties in Cactaceae from Eastern Brazil: Adding two new species and one new nothospecies to Tacinga (Opuntioideae)

Instituto Nacional do Semiárido – INSA, Av. Francisco Lopes de Almeida s/n, Serrotão, 58434-700, Campina Grande, Paraíba, Brasil.
Instituto Nacional do Semiárido – INSA, Av. Francisco Lopes de Almeida s/n, Serrotão, 58434-700, Campina Grande, Paraíba, Brasil.
University of Brasília, Secretaria da Coordenação de Pós-Graduação em Botânica – Caixa Postal 04457, CEP 70919-970, Brasília, DF, Brazil
Laboratório de Citogenética e Evolução Vegetal, Departamento de Botânica, Centro de Biociências, Universidade Federal de Pernambuco, 50670-901, Recife, Pernambuco, Brasil. Jardim Botânico da Usina de Arte, Rua da Praça s/n, distrito Santa Terezinha, 55552-970, Água Preta, Pernambuco, Brasil.
Instituto Nacional de Pesquisas da Amazônia – INPA, Av. André Araújo 2936, Petrópolis, 69067-375, Manaus, Amazonas, Brasil.
Instituto Nacional do Semiárido – INSA, Av. Francisco Lopes de Almeida s/n, Serrotão, 58434-700, Campina Grande, Paraíba, Brasil.
Independent researcher and cactus collector
Instituto Nacional do Semiárido – INSA, Av. Francisco Lopes de Almeida s/n, Serrotão, 58434-700, Campina Grande, Paraíba, Brasil.
Caatinga endemic cacti hybrid northeastern Brazil polyploidy succulents Eudicots

Abstract

Two new species and one new nothospecies of Tacinga from semi-arid Eastern Brazil are described. The new taxa were discovered on the basis of material collected during field trips carried out by staff of the Cactarium Guimarães Duque of the Instituto Nacional do Semiárido. A morphologic comparison of all the Tacinga species currently known, together with the cytogenetic analysis of the new taxa, are made. Full descriptions, illustrations, taxonomic discussions for all three new taxa are given as well as an identification key for all known Tacinga species. IUCN categories for the new taxa were assessed, resulting as endangered or critically endangered, due to their small population size and restricted distribution.