Contractile roots

 Hello everybody,
  A recent discussion on AEG about contractile roots on
Arisaemas prompted this question.  I dug Amorphophallus 
muelleri from a bed yesterday and they appeared to be at the
same depth of planting. I know they have roots that emerge
from the top to stabilize the plant, but do Amorphophallus
also have contractile roots to pull them further into the soil ?

Mike Bordelon

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