Achene morphology of Persicaria rotunda A dimorphic achenes under a stereoscope B–C SEM micrograph of L-morph achene B whole view C partial view showing its epidermis sculpture D–E SEM micrograph of S-morph achene D whole view E partial view showing its epidermis sculpture. Scale bars: 500 μm (B, D); 50 μm (C, E).