Mimosoideae (Leguminosae) in the Brazilian Chaco of Porto Murtinho, Mato Grosso do Sul

Abstract This research consists of the taxonomic-floristic treatment of taxa of Mimosoideae occurring in the Brazilian Chaco. The specimens analyzed were collected from 2004 to 2012 in Chaco remnants located in southwestern Mato Grosso do Sul, Brazil. Mimosoideae is represented by 39 taxa belonging to 14 genera; among the most representative, Mimosa (16 taxa) and Prosopis (4 taxa) are highlighted. Chloroleucon chacoense, Mimosa centurionis and Prosopis alba are new records for the Brazilian Flora. Prosopis nigra has its occurrence expanded. Mimosoideae is the second subfamily in species richness compared with other subfamilies of Leguminosae studied in the Brazilian Chaco. This work includes morphological descriptions, identification keys, illustrations and taxonomic comments.

摘要 本研究针对巴西查科地区分布的含羞草亚科（Mimosoideae）类群开展分类区系处理。本次分析的标本采集于2004至2012年，采自巴西南马托格罗索州西南部的查科残存植被斑块。研究共记录含羞草亚科植物39个分类单元，隶属于14个属；其中含羞草属（Mimosa）的16个分类单元与牧豆树属（Prosopis）的4个分类单元为优势类群。查科绿栾树（Chloroleucon chacoense）、百夫长含羞草（Mimosa centurionis）以及白牧豆树（Prosopis alba）为巴西植物区系新记录种；黑牧豆树（Prosopis nigra）的分布范围得到扩展。在巴西查科地区已开展研究的豆科（Leguminosae）各亚科中，含羞草亚科的物种丰富度位列第二。本研究包含形态描述、分种检索表、插图及分类学评述。