# Vianaea

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***Vianaea*** is a genus of [flowering plants](/source/Flowering_plant) in the family [Poaceae](/source/Poaceae). It includes a single species, ***Vianaea effusa***, a [bamboo](/source/Bamboo) endemic to eastern [Brazil](/source/Brazil).[1] It is common in open, rocky fields in the [Serra do Espinhaço](/source/Serra_do_Espinha%C3%A7o) of [Bahia](/source/Bahia) and [Minas Gerais](/source/Minas_Gerais) states from 900 to 1550 meters elevation, and on quartzite formations in the Quadrilátero Ferrífero of Minas Gerais.[2]

The species was first described as *Arundinaria effusa* by [Eduard Hackel](/source/Eduard_Hackel) in 1903. In 1973 [Floyd Alonzo McClure](/source/Floyd_Alonzo_McClure) placed the species in genus *[Aulonemia](/source/Aulonemia)* as *Aulonemia effusa*.[1] A [phylogenetic](/source/Phylogenetic) analysis published by Jesus-Costa *et al.* concluded that *Aulonemia* was paraphyletic, and the authors placed the species in the newly-described [monotypic](/source/Monotypic) genus *Vianaea* as *V. effusa.* The genus name *Vianaea* honors the Brazilian botanist Pedro Lage Viana, an authority on Brazilian *Aulonemia* who lived his early life in Minas Gerais state, in which type species primarily grows.[2]

## References

1. ["*Vianaea effusa* (Hack.) C.D.Tyrrell, L.G.Clark, Santos-Gonç. & Afonso"](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77350774-1). *[Plants of the World Online](/source/Plants_of_the_World_Online)*. [Royal Botanic Gardens, Kew](/source/Royal_Botanic_Gardens,_Kew). Retrieved 27 February 2026.

1. Cristielle de Jesus-Costa, Christopher D. Tyrrell, Pedro Lage Viana, Edgar Augusto Lobato Afonso, Luiz Orlando de Oliveira, Lynn G. Clark, Ana Paula Santos-Gonçalves "A Multi-Locus Plastid Phylogeny of the *Aulonemia* Clade (Poaceae: Bambusoideae: Bambuseae: Arthrostylidiinae) Reveals Three New Genera of Bamboo," *Systematic Botany*, 49(2), 334-363, (25 July 2024)

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