As tribos Dalechampieae Müll. Arg. e Manihoteae Melchior (Euphorbiaceae) no Distrito Federal, Brasil

AUTOR(ES)

Andresa Soares Rodrigues

DATA DE PUBLICAÇÃO

2007

RESUMO

The Federal District is located in Central Brazil, within the geographical coordinates 1530-1603S and 4719-4812W, in an area of 5,783 km. The vegetation in the Federal District is very varied in form, ranging from dense grasslands, usually with a sparse covering of shrubs and small trees, to almost closed woodlands. The family Euphorbiaceae has approximately 290 genera and around 7,500 species, distributed in the tropical and subtropical regions of the planet. In the Federal District it is represented by 22 genera, among which the most representative are Croton L., Manihot Mill. and Sebastiania Bertol. This paper is to contribute to the Federal District Flora by identifying the Manihoteae Melchior and Dalechampieae Müll. tribes, based on field collects and on the analysis of vouchers from the foollowing herbaria: Embrapa Genetic Resources and Biotechnology (CEN); University of Brasília (UB), Brazilian Institute for Geography and Statistics (IBGE), Brasília Botanic Garden (HEPH) and Botanical Institute of São Paulo (SP). The tribes Manihoteae and Dalechampieae are monogeneric. The genus Manihot is natural from the Americas, with two main diversity centers one located in Brazil (Minas Gerais, Goiás and inland Bahia), with around 80 species, and the other in Mexico, with around 18 species. The genus Dalechampia is tropical, well represented in the Americas with around 100 species. 18 taxa of these tribes were identified in the Federal District: four species of Dalechampia: D. caperonioides Baillon, D. humilis Müll. Arg., D. linearis Baillon D. triphylla Lam., and 13 species and a variety of Manihot: M. anomala Pohl, M. fruticulosa (Pax) Rogers &Appan, M. gracilis Pohl, M. hilariana Baillon, M. longepetiolata Pohl, M. nana Müll. Arg., M. nogueirae Allem, M. sparsifolia Pohl, M. pusilla Pohl, M. tripartita (Spreg) Müll. Arg., M. triphylla Pohl, M. tomentosa Pohl, M. violacea var. violacea Müll. Arg. and M. violacea var. cecropiifolia (Pohl) Müll. Arg. 80% of this taxa were observed at the field and collected. Manihot nogueirae is endemic from the São Bartolomeu river basin, M. hilariana, M. longepetiolata and D. triphylla are mentioned for the first time for the Federal District. Identifying keys, descriptions, illustrations and comments are presented.

ASSUNTO(S)

botanica brazil botânica - distrito federal (brasil) distrito federal euphorbiaceae manihot dalechampia

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