Bitter Rattan Plant (Calamus caesius L.) is one of Arecaceae family types that has a shrub habitus characterization, growing in clumps, and creeping on other plants. This plant is usually taken by the Rokan Hilir citizens as a traditional culinary called 'pangkek'. The aim of the study is to analyze the sequences barcodes DNA of matK and trnL-trnL-trnF IGS of bitter rattan plant (Calamus caesiu…