Amorphophallus species- Karnataka
Arisaema tortuosum (Wall.) Schott. SN Aug 52 : 5 posts by 4 authors. Attachments (3).
Arisaema tortuosum (Wall.) Schott., common herb in the shady forest floor, roadsides western ghats area adjacent to west cost, now in fruiting.
This is the fruit of a species of Amorphophallus [possibly A. commutatus]. Please check the archives of this group for my photographs of this.
Yes, the leaves resemble more to Amorphophallus than Arisaema.
I agree with ...; it is Amorphophallus sp.
It is possible that they grow in the same habitat thus can cause confusion. But they are easily distinguishable by their leaf, flower/infl. etc.
Here is the key from Flora of China:
Leaves variously divided (most commonly pedate to pedatisect but not decompound), very rarely entire; berries ripening reddish.  Arisaema
+Leaves commonly solitary, usually decompound, very rarely pedate, never entire; berries ripening red or blue.  Amorphophallus