| Affiliation: | 1.Programa de Pós-Gradua??o em Botanica,Universidade Estadual de Feira de Santana,Feira de Santana,Brazil;2.Universidade do Estado da Bahia,Senhor do Bonfim,Brazil;3.Departamento de Ciências Biológicas, Laboratório de Micromorfologia Vegetal,Universidade Estadual de Feira de Santana,Feira de Santana,Brazil |
| Abstract: | This study dealt with six species of Acalyphoideae and 18 species of Euphorbioideae occurring in the Caatinga ecoregion, with emphasis on endemic species. Pollen samples were obtained from herbarium specimens and were acetolysed and analysed via light and scanning electron microscopy. The pollen of three genera of Acalyphoideae was medium to large, 3-colporate or 3-colpate, with an echinate-perforate exine that was reticulate, bireticulate, and microreticulate. The six genera of Euphorbioideae studied exhibited pollen grains that were small, medium and large; 3-colporate with margines; and an exine with microreticulate, microreticulate-rugulate, microreticulate-caveate, and reticulate ornamentation. The pollen characteristics were more variable in the Acalyphoideae compared to the relatively homogeneous Euphorbioideae. This study provides new data and interpretations of the pollen morphology of two subfamilies of the Euphorbiaceae of the Caatinga ecoregion in Brazil. |
