This study used pollen morphology to address taxonomic controversies related to several species belonging to subgenus Hebeclada of the genus Polygala (Polygalaceae). According to the last traditionally accepted revision of this subgenus, it comprises 40 species. Nevertheless, a recent taxonomic treatment applying more comprehensive criteria reduced this number to only nine species. Our work focused on 15 traditionally accepted species that occur in Brazil, fourteen of which have been considered as only six species in this recent taxonomic study. Pollen grains from floral buds at pre-anthesis were collected from herbarium specimens and analysed using both visible light and scanning electron microscopy. Most of the traditionally accepted species were distinguished by different combinations of several pollen-related features, in particular colpi number (13 or 15), pollen size and shape, and endoaperture type (endocingulate or not) and arrangement (parallel or sinuous). The species accepted in the recent taxonomic treatment could not be discriminated by pollen characters.
Lüdtke, R.; Aguiar, A. C. A. A note about the occurrence of reduced petals in species of Polygala L. subgenus Hebeclada (Chodat) Blake (Polygalaceae) from southern Brazil. Biota Neotrop., vol 8, no. 1, Jan./Mar. 2008. Available from: Abstract: The number of petals in the flowers is a taxonomic character used in the circumscription of the subgenera of Polygala. Until now, the corolla of the species of subgenus Hebeclada was described having tree petals, one inferior and central called carina and two lateral adnated to the staminal sheath. Among the 12 subgenera of Polygala, the occurrence of trimerous corolla was only known in subgenera Polygala and Hebeclada. This paper presents the discovery of pentamerous corolla in species of Polygala subgenus Hebeclada, presenting photos and additional comments about this reduced petals unknown for the subgenus until this moment. Keywords: corolla, Polygala, subgenus Hebeclada, Polygalaceae, southern Brazil. Resumo: O número de pétalas é um dos caracteres taxonômicos utilizados na circunscrição dos subgêneros de Polygala. Até o momento, a corola das espécies do subgênero Hebeclada era descrita apresentando apenas três pétalas, uma inferior e central, denominada carena e duas laterais superiores aderidas à bainha estaminal. Dentre os 12 subgêneros de Polygala, a ocorrência de corola trímera era registrada apenas nos subgêneros Polygala e Hebeclada. O presente trabalho trata da ocorrência inédita de corola pentâmera em espécies de Polygala do subgênero Hebeclada, apresentando fotografias e comentários adicionais sobre estas pétalas reduzidas, não referidas para o subgênero até o momento.
RESUMO(Polygala fontellana Marques & Aguiar (Polygalaceae), uma nova espécie para o Brasil) Uma nova espécie de Polygalaceae é descrita para os estados da Bahia e Minas Gerais, até o momento endêmica da Cadeia do Espinhaço. Polygala fontellana Marques & Aguiar pertence ao subgênero Polygala por apresentar carena cristada. São fornecidos descrição, diagnose, ilustração e comentários sobre a sua distribuição geográfica, floração e frutificação. Palavras chave: taxonomia, campo rupestre, flora.
ABSTRACT(Polygala fontellana Marques & Aguiar (Polygalaceae), a new species in Brazil) A new species of Polygalaceae is described from Bahia and Minas Gerais State, currently endemic to Cadeia do Espinhaço. Polygala fontellana Marques & Aguiar belongs to subgenus Polygala by keel cristate. Description, diagnoses, illustrations and comments about the geographic distribution, phenology are provided.
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