I have brought some low growing Persicaria from my brother's garden to grow under the shrubs at the back of my pond. Looking online for help for ID. I have narrowed it down to P. affinis or P. bisorta. Is there another way to tell the difference?

thanks in advance.
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Looks like Persicaria affinis.
https://www.google.co.uk/search?q=Persicaria+affinis&rlz=1C1GNAM_en-GBGB687GB687&source=lnms&tbm=isch&sa=X&ved=0ahUKEwidz_eU8tbVAhWsKMAKHSdQA-wQ_AUICigB&biw=1536&bih=759
Last edited: 14 August 2017 15:04:55
thank you Silver surfer. I was kind of thinking towards that too.