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The two forms of N. rafflesiana used in this study. (A) Typical form, upper pitcher. The pitchers are ∼10–15 cm long, lack wax crystals on the inner pitcher wall, and contain viscoelastic fluid. (B) Elongate form, upper pitcher. The pitchers are approximately twice as long as pitchers of the typical form, have a well-developed wax crystal layer on the inner pitcher wall, and mostly contain watery fluid. (This figure is available in colour at JXB online.)
