Abstract
Pollen morphological studies of 19 species of Oryza (Poaceae) were carried out using LM and SEM. Eleven exine surface patterns are distinguished at x 20,000 magnification under SEM. These are categorised into three basic types: granulose, spinulose and insular. O. brachyantha‐ a genomically unrelated species, and two species (O. granulata and O. meyeriana) comprising the O. meyeriana complex have spinulose exine surfaces. The O. ridleyi complex which also contains two species (O. longiglumis and O. ridleyi) is characterised by a granulose exine pattern. In the O. officinalis complex and the O. sativa complex, both granulose and insular exine patterns have been observed in different species. The largest pollen grains occur in the O. sativa complex, which contains both cultivated species and their wild relatives.
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