&lt;p&gt;&lt;strong&gt;Notes on an overlooked &lt;em&gt;Paepalanthus&lt;/em&gt; (Eriocaulaceae) from central Brazil: identity, taxonomic placement, and morphological details&lt;/strong&gt;&lt;/p&gt;

Silva, Lucas Espindola Florêncio da; Trovó, Marcelo

doi:10.11646/phytotaxa.442.1.5

Phytotaxa

2020

DOI: 10.11646/phytotaxa.442.1.5

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Notes on an overlooked Paepalanthus (Eriocaulaceae) from central Brazil: identity, taxonomic placement, and morphological details

Lucas Espindola Florêncio da Silva

Marcelo Trovó

Abstract: Paepalanthus canescens var. atratus was described from a single collection of juvenile individuals. We have recently rediscovered new populations of this taxon, and here describe the flowers for the first time. The vegetative and floral morphology of this taxon does not fit the P. canescens concept, nor does the taxon share the characters defining P. subsect. Actinocephaloides, to which P. canescens belongs. Here, we raise the taxon to species level, as P. atratus, and provide a revised description for it. We … Show more

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Cited by 3 publications

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In support of a broad concept of Paepalanthus (Eriocaulaceae)

Stützel,

Trovó,

Echternacht

et al. 2024

TAXON

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We here evaluate the conflicting recent splitter and lumper strategies concerning the generic classification system of the Eriocaulaceae, and whether Paepalanthus s.str. and its proposed segregate genera are morphologically recognizable. To this end, we examine evidence from inflorescence branching patterns, seed coat, and phylogeny in detail, and contrast circumscriptions of genera with the available data. We also indicate possible consequences of the proposed system for herbarium curators, keepers and users of large databases, and generalist users of identification keys. We argue that the morphological circumscriptions of Paepalanthus s.str. and of most of the other 11 segregate genera lack coherence. The majority of characters used as potential synapomorphies or in diagnoses are not sufficient to support the genera because they conflict with or do not represent the morphology of all the included species. The information regarding inflorescence branching patterns and seed coat are interpreted ambiguously or represent preliminary results, and some characters are known for only a limited number of species. Inflorescences are difficult to interpret in herbarium specimens, and the seed coat mostly requires SEM analysis for proper visualization, thus hindering identification. On the other hand, Paepalanthus s.l. can be identified by a combination of floral characters, as can the remaining genera of the family. We therefore endorse the recognition of Paepalanthus s.l. as a single, nomenclaturally stable, and monophyletic entity. This is the best‐fitting solution to reflect both evolutionary and morphological aspects of this recently diversified lineage. Finally, we provide a new identification key for the 7 genera of the Eriocaulaceae, characterizing Paepalanthus s.l. by floral characters that can be observed in any flowering specimen.

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In support of a broad concept of Paepalanthus (Eriocaulaceae)

Stützel,

Trovó,

Echternacht

et al. 2024

TAXON

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Unraveling the identity of Paepalanthus decorus (Eriocaulaceae)

Silva

Trovó

2021

Phytotaxa

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Paepalanthus decorus was described by Delia Abbiatti from a single collection of individuals made by Carlos Luis Spegazzini in Uruguaiana, Rio Grande do Sul state, Brazil, deposited at the La Plata Museum. The species is known only from the type specimens, which were unusual for being collected far to the south of the distribution of the other species included in P. sect. Diphyomene. In recent nomenclatural treatments for P. sect. Diphyomene, P. decorus was disregarded, remaining known only from its original publication. Here, we critically evaluate the protologue, type specimens, and the vegetative and floral morphology of this species. As a result, we propose its synonymization under P. flaccidus. A detailed comparison of these species is provided, along with comments on typification, with a lectotype designated for P. flaccidus.

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The Paepalanthoideae (Eriocaulaceae) of the Chapada dos Veadeiros National Park, Brazil: taxonomic novelties, identification key, and illustrated list of species

Trovó

Echternacht

2022

EJT

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The Chapada dos Veadeiros National Park is a conservation unit established to preserve the highest savannahs of Central Brazil and their unique biodiversity. Eriocaulaceae are a relevant and conspicuous family in such high savannahs, but its diversity is poorly known, documented solely in general lists or in isolated efforts aimed at small groups. After a structured series of field expeditions and analysis of specimens from the relevant herbaria, we provide nomenclatural novelties, a first identification key, and an illustrated checklist for the species of Paepalanthoideae (Eriocaulaceae) in the area. We recorded 42 species of Paepalanthoideae from the Chapada dos Veadeiros National Park: Actinocephalus (Körn.) Sano (2 spp.), Comanthera L.B.Sm. (1 sp.), Paepalanthus Mart. (24 spp.), and Syngonanthus Ruhland (15 spp.). Actinocephalus brevifolius Trovó & Echtern. sp. nov. and P. irwinii Trovó & Echtern. sp. nov. are newly described species and P. politus Trovó stat. et nom. nov. is a variety of P. elongatus (Bong.) Körn. raised to the species status with a new name. The generic and specific composition shows predominance of Paepalanthus and Syngonanthus, and with a low representation of Actinocephalus and Comanthera, as expected, outside of the Espinhaço Range. More than 50% of the species (22 spp.) are endemic to the area and 25 species are endemic to Central Brazil, the area being the main center of diversity for dimerous-flowered groups. The non-endemic diversity is a combination of widespread species and marginal distribution of species typical from the Amazon and southeastern savannahs. The species are unevenly distributed in the area, with their occurrence correlated to altitude, water availability, and lithology. We reinforce that the savannahs from Central Brazil are a secondary center of diversity for Eriocaulaceae, playing a central role in the conservation of an unique and irreplaceable piece of its diversity and the Cerrado biome as well.

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<p><strong>Notes on an overlooked <em>Paepalanthus</em> (Eriocaulaceae) from central Brazil: identity, taxonomic placement, and morphological details</strong></p>

Cited by 3 publications

References 1 publication

In support of a broad concept of Paepalanthus (Eriocaulaceae)

In support of a broad concept of Paepalanthus (Eriocaulaceae)

Unraveling the identity of Paepalanthus decorus (Eriocaulaceae)

The Paepalanthoideae (Eriocaulaceae) of the Chapada dos Veadeiros National Park, Brazil: taxonomic novelties, identification key, and illustrated list of species

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