Apocynaceae is clearly monophyletic, as indicated by the presence of milky latex and a highly modified gyneum with separate ovaries and a modified stylet head. Prestonia (Apocynoideae / Echiteae), is composed of about 55 species, distributed from Mexico to Argentina, and in Brazil, 24 species occur. This work aimed to catalog the species of the genus Prestonia occurring in Lavras. Description of the species was carried out, as well as an identification key. A comparison was made with other surveys, which indicated the occurrence of these genera, in order to identify the representativeness of these species in the municipality. The study recommended the consultation in the ESAL Herbarium, as well as the herbs SPF, HUEFS, JBRJ, NY and UEC, which presented collections of Lavras. The results of the present study were also compared with five other studies performed through two-way cluster analysis. Four species were identified: Prestonia coalita, P. riedelli, P. tomentosa and P. erecta. The highest specific diversity was observed in Lavras, with four species, and P. erecta and P. riedelli only ran in this area. Carrancas presented two species, P. coalita and P. tomentosa, being the most similar to Lavras. Prestonia coalita was present in three areas, being the most widespread species. Although Lavras presented a reduced territorial extension, the diversity of the taxa in question was considerable.
O objetivo deste trabalho foi catalogar as espécies dos gêneros Ditassa e Minaria ocorrentes no município de Lavras. Foi realizada a descrição das espécies, e uma chave de identificação. Uma comparação foi realizada com a ocorrência relatada em outros levantamentos realizados, a fim de se identificar a representatividade dessas espécies no município. O trabalho preconizou a consulta no Herbário ESAL, bem como os herbários SPF, HUEFS, JBRJ, NY e UEC, que apresentavam coletas para o município de Lavras. Os resultados do presente estudo foram também comparados com outros cinco estudos realizados, através da análise hierárquica de agrupamento (Two-way Cluster). Foram encontradas cinco espécies: Ditassa eximia, D. lenheirensis, D. mucronata, Minaria acerosa e M. cordata. Quanto ao grau de endemismo, M. cordata ocorreu apenas em Lavras, sugerindo que essa espécie possa ser endêmica do local. A maior similaridade ocorre entre Lavras e a Cadeia do Espinhaço. Mesmo Lavras apresentando uma extensão territorial reduzida, a diversidade dos táxons em questão foi considerável, revelando uma espécie de ocorrência limitada para a região.
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