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August 16, 2025

Synopsis of Monteiroa (Malvaceae, Malvoideae)

Key Points

Eleven species of monteiroa are known, with seven classified as threatened, indicating conservation challenges.
The species thrive mainly in wetlands and river margins, emphasizing their ecological niche and habitat requirements.
This assessment includes a taxonomic key, distribution maps, and habitat illustrations for nine species—critical for identification.
Conservation status is highlighted, with five species listed as Endangered and two as Critically Endangered, calling for immediate action.

Abstract

Monteiroa Krapovickas is a genus essentially South-Brazilian, with one species reaching Uruguay and Argentina and another exclusive to the southeastern region of Brazil. So far, 11 species are known, including one recently described, M. rubra. The species of the genus grow mainly in wetlands and river margins. This synopsis includes a taxonomic key, illustrations, information about habitat, maps with geographical distribution, nomenclatural and taxonomic notes, general comments on the biology, ecology and conservation status for all the species. Two names were lectotypified Malvastrum bullatum and Malvastrum dusenii, basionyms of Monteiroa bullata and Monteiroa dusenii, respectively. For nine species, photos of them in their habitat are presented for the first time, with the exception of M. leitei and M. triangularifolia. Seven species were considered threatened, five Endangered (EN), M. dusenii, M. hatschbachii, M. ptarmicifolia, M. rubra, M. smithii and two Critically Endangered (CR), M. leitei and M. triangularifolia.

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Synopsis of Monteiroa (Malvaceae, Malvoideae)

Key Points

Abstract

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