Description and phylogenetic relationships of a new, purple-flowered, endangered Schomburgkia (Laeliinae; Orchidaceae) from north-eastern Brazil

EDLLEY M. PESSOA; VINÍCIUS BRITO; FRATERNO RALF-NETO; GEYSLA FERNANDES; GUSTAVO GOMES; ELMARY FRAGA; MARIA CLAUDENE BARROS

doi:10.11646/phytotaxa.561.2.3

Issue: Vol. 561 No. 2: 8 September 2022

Type: Article

Published: 2022-09-08

DOI: 10.11646/phytotaxa.561.2.3

Page range: 151-161

Abstract views: 68

PDF downloaded: 3

**Description and phylogenetic relationships of a new, purple-flowered, endangered Schomburgkia (Laeliinae; Orchidaceae) from north-eastern Brazil**

EDLLEY M. PESSOA⁺⁻
VINÍCIUS BRITO⁺⁻
FRATERNO RALF-NETO⁺⁻
GEYSLA FERNANDES⁺⁻
GUSTAVO GOMES⁺⁻
ELMARY FRAGA⁺⁻
MARIA CLAUDENE BARROS⁺⁻

Laboratório de Estudos Integrados de Plantas, Departamento de Botânica e Ecologia, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil; Universidade Estadual do Maranhão, Departamento de Química e Biologia, Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, 65604-375, Caxias, Maranhão, Brazil

Núcleo de Orquidologia, Associação dos Orquidófilos e Bromeliófilos de Alagoas, 57035-330, Maceió, Alagoas, Brazil

Universidade Estadual do Maranhão, Departamento de Química e Biologia, Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, 65604-375, Caxias, Maranhão, Brazil

Universidade Federal de Pernambuco, Departamento de Botânica, Programa de Pós-graduação em Biologia Vegetal, Recife, Pernambuco, Brazil

Universidade Estadual do Maranhão, Departamento de Química e Biologia, Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, 65604-375, Caxias, Maranhão, Brazil

Atlantic Forest flora Epidendreae Epidendroideae orchid endemism rock outcrop flora threatened South American taxa Monocots

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Abstract

We describe a new species of Schomburgkia, S. vandenbergiana, from north-eastern Brazil and provide a phylogenetic analysis and a summary of its conservation status. Our phylogenetic analyses indicate that S. vandenbergiana is most likely related to S. undulata and S. gloriosa. The species with dark purple flowers, S. elata, S. splendida, S. undulata and S. vandenbergiana, did not form a clade, and this trait seems to have multiple independent origins. Based on small flower size and number of keels on the disc of the lip, the new species is morphologically more similar to S. heidii, a species native to Colombia and Venezuela, but it differs in the shorter sepals and lip and erose clinandrium margin. The new species should be classified as endangered (EN) based on the IUCN criteria B1ab(i)+2ab(ii).

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