Dear Sawmliana ji,
This is clearly C. fallax in my view. The blade has a generally dark hue, and mostly rounded outline with distinct sinus.
The pale blush, and purple patches on blades (not in your photo, but seen by me in Meghalaya) are highly variable, within and between local populations.
My only experience of C. affinis is with the ornamental form, var. jenningsii, of unknown original provenance. That plant was much more tender or cold sensitive than C. fallax (which I had growing alongside C. affinis, in Australia and Japan, in 1987-1990). In Meghalaya, winter temperatures go down to 3-4 deg. C. apparently.
In places where you have seen C. affinis in Mizoram, would temperatures get that cold?
Best regards, Peter
From: J.M. Garg <jmg...@gmail.com
Sent: Monday, 3 May 2021 4:18 PM
Cc: M Sawmliana
Subject: Fwd: [efloraofindia:383852] MS, April, 2014/03 Colocasia sp. for id.
Yes, may be Colocasia fallax<https://efloraofindia.com/2014/09/03/colocasia-fallax/
> as per discussions at Wild Alocasia sp. 1 (?) from Kamrup district, Assam<https://groups.google.com/forum/?hl=en&fromgroups#!topic/indiantreepix/UNNKys1yp-Y
---------- Forwarded message ---------
From: M Sawmliana <msawm...@gmail.com
Date: Tue, 27 Apr 2021 at 20:39
Subject: [efloraofindia:383852] MS, April, 2014/03 Colocasia sp. for id.
To: indiantreepix <indian...@googlegroups.com
Location : Lengpui, Mizoram
Habit : Herb
Habitat : Wild
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