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When the apex of the spathe is caudate and almost filiform and the appendix is not longer than the spathe and straight it is jacquemontii. The spathe tip of tortuosum is not pointed/caudate and the appendix is sigmoidally curved (like an elephant trunk) pointing upwards. There is reference to Chennai in the thread so I am not sure where the picture is taken but if it is from S India then it is what used to be described as Arisaema wightii, now accepted as a full synonym of jacquemontii. Either way, it is jacquemontii.
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