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Issue: Vol. 660 No. 3: 23 Jul. 2024
Type: Article
Published: 2024-07-23
DOI: 10.11646/phytotaxa.660.3.5
Page range: 278-286
Abstract views: 62
PDF downloaded: 5

A new species of Phyllanthus (Phyllanthaceae) hiding in the shades in an urban Atlantic Forest in Rio de Janeiro State, Brazil

Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171–900, Recife, PE, Brazil
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, 22460–030, Rio de Janeiro, RJ, Brazil
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, 22460–030, Rio de Janeiro, RJ, Brazil
Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Ciências Florestais, Avenida Pádua Dias, 11, Independência, Caixa Postal 09, 13418‒900, Piracicaba, SP, Brazil
Universidade Estadual de Campinas, Instituto de Biologia, Rua Monteiro Lobato, 255, Cidade Universitária, 13083‒862, Campinas, SP, Brazil
Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171–900, Recife, PE, Brazil
Eudicots Malpighiales neotropics Phyllanthoideae taxonomy

Abstract

A new and critically endangered species of Phyllanthus, endemic to the Parque Nacional da Tijuca in Rio de Janeiro State, Brazil, is described and illustrated here. Phyllanthus celatus is placed in Phyllanthus subgenus Phyllanthus section Phyllanthus subsection Phyllanthus. Morphologically it resembles P. augustinii, P. lobatus and P. niruri, but differs mainly by presenting reddish primary, secondary and intersecondary veins on the abaxial surface (vs absent in both species), and 5-lobed pistillate disc (vs entire only in P. augustinii and P. niruri). Of these, only P. lobatus has a lobed disc, but it differs in pistillate sepals light green (vs whitish or slightly pinkish), deeply 5-lobed pistillate glandular disc (vs 3–5-lobed), styles erect (vs curved), and geographic distribution restricted to the Southeast (vs South). The systematic position of this species and its morphological relationships with allies are discussed and field photographs, illustrations, a distribution map, preliminary conservation status, and taxonomic notes are provided.

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