Arenga species- Bot. Garden, Kolkata


Images by Surajit Koley (Inserted by J.M.Garg) (For more photos & complete details, click on the links)
IBG today : Arecaceae : unknown11 : 7 posts by 2 authors. Attachments (7).  
This has glaucous abaxial. The last pic is of an unknown small snail, I think.
It is not glaucous but silvery - Arenga engleri Becc.?
Without details of inflorescences/fruits this is not straightforward. If as you say cult. in Kolkata then it could be any one of several Arenga spp