Abstract

• The pollen morphology of 10 species belonging to 10 genera of 5 families in Sapindales and Brassicales were studied. The specimens were collected from Mandalay and Bago Regions from May 2018 to December 2020. The collected species were 6 species of Sapindales and 4 species of Brassicales. The morphological characters of pollen grains of each species were also studied. The pollen grains of all species examined in this study are generally monads. The types of pollen grains were colpate and colporate. One, nine species were colpate and colporate respectively. The shapes of pollen were oblate spheroidal, spheroidal, suboblate and subprolate. The smallest pollen (9.0 – 14.0 µm) was found in Limonia acidissima L. and the largest pollen (30.0 – 32.6 µm) was observed in Hypselandra variabilis (Collett & Hemsl.) Pax & K. Hoffm. The sculpture patterns of pollen grains were psilate in 1 species, reticulate in 4 species and obscurely reticulate in 5 species. The pollen photomicrographs of each species were observed by polar view and equatorial view. The pollen morphology provides for identification and future systematic research work of orders Sapindales and Brassicales.