This study aimed to investigate the taxonomic characteristics based on micromorphology and macromorphology of Cyperaceae species and to build the taxonomic key based on these characteristics. The research method involved the use of light and electron microscopy. Sampling was carried out in four areas of Tanjong Malim, Ipoh, Kuala Kangsar and Gerik covering different ecology of open areas, wetlands and limestone. The findings showed that four out of the thirteen studied species; Cyperus compactus, C. compressus, C. iria, and C. kyllingia are common species found in all studied areas. Cyperus sphacelatus is limited to Gunung Lang, Ipoh while C. pulcherrimus often found in Pulau Banding, Gerik. This study showed the diagnostic characteristics of flower and spikelet is in agreement with the classification of Koyama, Eiten, Dahlgren, Tucker, Bruhl and Goetghebeur. Its diagnostic macromorphological characters have successfully been applied for developing the taxonomic key of Cyperaceae. The .....

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