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Resumen Orchidaceae es una de las familias botánicas más estudiadas desde el punto de vista taxonómico y económico en el mundo. En Uruguay es poco conocida y los datos descriptivos que existen se encuentran fragmentados y dispersos. En este trabajo se presenta un inventario de la familia así como su distribución en ambientes, eco-regiones y departamentos del país basados en los registros de herbarios, publicaciones existentes y expediciones de campo realizadas durante el 2018-2019. Se presenta una lista con 59 especies en 18 géneros. Se encontraron cuatro especies endémicas de Uruguay, mientras que 22 spp. son endémicas del Cono Sur. La Cuenca Sedimentaria Gondwánica fue la eco-región en presentar mayor diversidad de especies (51%) y los departamentos con mayor riqueza fueron Cerro Largo (25 spp.) y Maldonado (25 spp.). Mientras que el Bosques Serranos y Bosque Ribereño fueron los más ricos en especies de orquídeas. Los géneros más representativos fueron Habenaria (12 spp.), Cyclopogon (8 spp.) y Brachystele (6 spp.) y las especies que presentaron distribución amplia fueron Habenaria gourlieana, H. parviflora, y Cyclopogon elatus, las cuales se encontraron en todas las eco-regiones y en 15 de los 19 departamentos del país.

Abstract From an economic and taxonomic point of view, Orchidaceae is one of the most studied botanical families. In Uruguay it is poorly represented and known, and descriptive data are fragmented and scattered. In the present work the information on the species of this family is updated based on herbaria records, previous publications and field trips made in the country during 2018-2019. A list of Orchidaceae from Uruguay is presented with 59 species belonging to18 genera. Four species were found endemic to the country, while 22 species are endemic to the Southern Cone region. The Gondwanic Sedimentary Basin was the ecoregion with the highest species diversity (51%) and the richest departments were Cerro Largo (25 spp.) and Maldonado (25 spp.). The Highland Forest and Riparian Forest environments presented highest diversity. The most representative genera were Habenaria (12 spp.), Cyclopogon (8 spp.), and Brachystele (6 spp.). The species with the widest distribution were Habenaria gourlieana, H. parviflora, and Cyclopogon elatus, which were found in all ecoregions and in 15 out of 19 departments of the country.

Resumo Um levantamento atualizado das plantas com sementes e análises relevantes acerca desta biodiversidade são apresentados. Este trabalho se iniciou em 2010 com a publicação do Catálogo de Plantas e Fungos e, desde então vem sendo atualizado por mais de 430 especialistas trabalhando online. O Brasil abriga atualmente 32.086 espécies nativas de Angiospermas e 23 espécies nativas de Gimnospermas e estes novos dados mostram um aumento de 3% da riqueza em relação a 2010. A Amazônia é o Domínio Fitogeográfico com o maior número de espécies de Gimnospermas, enquanto que a Floresta Atlântica possui a maior riqueza de Angiospermas. Houve um crescimento considerável no número de espécies e nas taxas de endemismo para a maioria dos Domínios (Caatinga, Cerrado, Floresta Atlântica, Pampa e Pantanal), com exceção da Amazônia que apresentou uma diminuição de 2,5% de endemicidade. Entretanto, a maior parte das plantas com sementes que ocorrem no Brasil (57,4%) é endêmica deste território. A proporção de formas de vida varia de acordo com os diferentes Domínios: árvores são mais expressivas na Amazônia e Floresta Atlântica do que nos outros biomas, ervas são dominantes no Pampa e as lianas apresentam riqueza expressiva na Amazônia, Floresta Atlântica e Pantanal. Este trabalho não só quantifica a biodiversidade brasileira, mas também indica as lacunas de conhecimento e o desafio a ser enfrentado para a conservação desta flora.

Abstract An updated inventory of Brazilian seed plants is presented and offers important insights into the country's biodiversity. This work started in 2010, with the publication of the Plants and Fungi Catalogue, and has been updated since by more than 430 specialists working online. Brazil is home to 32,086 native Angiosperms and 23 native Gymnosperms, showing an increase of 3% in its species richness in relation to 2010. The Amazon Rainforest is the richest Brazilian biome for Gymnosperms, while the Atlantic Rainforest is the richest one for Angiosperms. There was a considerable increment in the number of species and endemism rates for biomes, except for the Amazon that showed a decrease of 2.5% of recorded endemics. However, well over half of Brazillian seed plant species (57.4%) is endemic to this territory. The proportion of life-forms varies among different biomes: trees are more expressive in the Amazon and Atlantic Rainforest biomes while herbs predominate in the Pampa, and lianas are more expressive in the Amazon, Atlantic Rainforest, and Pantanal. This compilation serves not only to quantify Brazilian biodiversity, but also to highlight areas where there information is lacking and to provide a framework for the challenge faced in conserving Brazil's unique and diverse flora.

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

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