Aroids leaves' structure.

Hello,
 
I know that a typical aroid leaf (for example of Spathiphyllum or Arum).
There is a petiole and the blade (sometimes with a geniculum between them).
The blade consists of a midrib, primary, secondary etc. veins, a marginal vein and often a submarginal vein.
This is simple, but the structure in other genera is so modified that often a petiole is taken as a stem etc.
 
Does anybody have a scheme of Amorphophallus leaf?
Is it a compound leaf (like in Fabaceae or Aesculus) or a single one?
Does it have a midrib? Is it always divided into 3 "branches" in adult plants?
When the juvenile leaflets become more divided as the plant grows, what is the name of such divided leaflets?
 
I'd like to know the same about the leaf of Typhonium/Sauromatum venosum.
 
Is there any name for the sinus between posterior lobes reaching behind the petiole in Caladium or Alocasia odora? Pelta?
 
What type is the venation in Pistia?
 
Best,
Marek
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