Adult Syngoniums will have the palmately divided leaves so long as they are attached and climbing. I've noticed that even on mature Pothos, sometimes runners with juvenile leaves are produced. Some people take a tip from a mature specimen (Pothos or Syngonium) and root it upright as though it were still climbing, and it may continue to produce mature leaves even though it is not high up in a tree.
Just some observations,
LariAnn
