Pollen morphology of the Sapotaceae from Thailand and its taxonomic implications

The external pollen morphology of the family Sapotaceae in Thailand was examined using acetolysis method to determine its taxonomic significance. Pollen 39 specimens belonging 32 species investigated by means light and scanning electron microscopy. grains are found be monads, isopolar, colporate, lalongate, variable size, shape, aperture number, colpus length exine thickness. Exine ornamentation is also variable, showing more than one pattern on a single grain. Principal component analysis based 13 characters identified three groups: Chrysophyllum, Madhuca Pouteria types ratio polar axis sculpturing. taxonomically useful classification Thai Sapotaceae, especially status Planchonella species.