Many thanks to Shrikant Ingalhalikar for the ID.
This observation is featured in POWO and Flowers of India as Zingiber cernuum Dalzell.
Zingiber cernuum Dalzell and Zingiber nimmonii (J.Graham) Dalzell are confusingly close in superficial appearance; hope we find some study done on its natural distribution in Konkan and Western Ghats of Maharashtra to resolve any ambiguity(s).
I am not very sure of this classification.. However as this species is known to be in India, I am proposing this for now and requesting others to help me identify the correct species.