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Abstract Detail

Floristics & Taxonomy

Freitas Azevedo, Igor Henrique [1], Rodrigues de Moraes, Pedro Luís [2].

Sanchezia and Suessenguthia (Acanthaceae) in Brazil.

Acanthaceae is a pantropical family with about 190 genera and over 4000 species, but it has several taxonomic knowledge gaps. Among the Brazilian flora, many groups of Acanthaceae are in urgent need of taxonomic revisions, and one of those is Sanchezia Ruiz & Pav, a Neotropical genus of over 50 species, mostly from the Amazon Forest. There are six species registered in Brazil, but their identifications are doubtful and imprecise. Suessenguthia Merxm. is its sister group, with seven species total, one in Brazil. In the current study, we aimed to revise the taxonomy of the Sanchezia and Suessenguthia taxa in Brazil. We analyzed 53 herbarium specimens from native plants in Brazil, plus 101 from cultivated/invasive ones and several others from other countries for comparison, presently or by online images. We described the morphology based on standard bibliography, elaborated maps of geographic distribution, identification keys, and illustrative plates of the studied taxa. Nine species of Sanchezia and one of Suessenguthia were found occurring naturally in Brazil (including their newly proposed synonyms): Sanchezia cyathibractea Mildbr. (=S. pennellii Leonard), S. lispa Leonard & L.B. Sm., S. loranthifolia Lindau, S. munita (Nees) Planch., S. oblonga Ruiz & Pav. (=S. speciosa Leonard), S. ovata Ruiz & Pav., S. scandens (Lindau) Leonard & L.B. Sm. (=S. decora Leonard & L.B. Sm.), S. tarapotensis Leonard & L.B. Sm., S. thinophila Leonard, and Suessenguthia trochilophila Merxm. Besides Sanchezia oblonga, S. parvibracteata Sprague & Hutch. and S. tigrina Leonard are widely cultivated in Brazil. The most important characters to differentiate the species are those on the inflorescence patterns and shape and dimensions of bracts and calyx lobes. The studied species occur naturally in the northern states of Acre, Amapá, Amazonas, Pará, and Rondônia, mainly in the understory of forest vegetation. Differently from the eastern Andean foothills – considered the diversity center of those genera –, they are rarely collected and have a sparse distribution in the Brazilian lowlands towards the East. Some species reach the northern coast of Pará, probably dispersed by the Amazonas River and its affluents, as well as it happens in northern Venezuela through the Orinoco River. The taxonomic novelties include three synonymizations, new records of four species in Brazil (Sanchezia lispa, S. ovata, S. tarapotensis, and S. thinophila), new records in the states of Amapá and Rondônia, and the expansion of S. munita to southern Colombia – previously considered to be endemic from Brazil.

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Related Links:
Sanchezia in Flora do Brasil 2020
Suessenguthia in Flora do Brasil 2020

1 - São Paulo State University (UNESP), Institute of Biosciences, Department of Biodiversity, Rua 7 A, n. 855, Vila Alemã, Rio Claro, São Paulo, 13506569, Brazil
2 - São Paulo State University (UNESP), Institute of Biosciences, Department of Biodiversity, Avenida 24 A, 1515, Bela Vista, Rio Claro, São Paulo, 13506900, Brazil

Amazon Forest
South America

Presentation Type: Poster
Session: P2, Floristics & Taxonomy Posters
Location: Virtual/Virtual
Date: Tuesday, July 20th, 2021
Time: 5:00 PM(EDT)
Number: P2FT008
Abstract ID:712
Candidate for Awards:None

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