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Genetic variation within and between four naturally occurring Phragmites australis land populations, DBS, QG, SS1 and SS2 (named after locality), which colonise distinct habitats (different edaphic conditions) in the Songnen Prairie in northeast China, were investigated by amplified fragment length polymorphism (AFLP) and sequence‐specific amplification polymorphism (S‐SAP) markers. It was found that the selected primer combinations of both markers were highly efficient in revealing the inter‐clonal genetic diversity and inter‐populational genetic differentiation in P. australis from a molecular ecological perspective. Cluster analysis categorised the plants into distinct groups (DBS, QG and SS groups), which were in line with their localities, albeit the two SS group populations (SS1 and SS2) showed a lower degree of inter‐populational differentiation. These results were strongly supported by multiple statistical …