Begonia imperialis

Begonia imperialis Lem., Ill. Hort. 7: 53 1860. (syn: Begonia imperialis var. brunnea Lem.; Begonia imperialis var. maculata Lem.; Begonia imperialis var. smaragdina Lem.; Begonia smaragdina (Lem.) Verschaff.);  

Mexico Gulf; Mexico Southeast; Mexico Southwest as per Catalogue of Life;
Begonia rex :: Dattaji Salvi Udyan :: 13 MAY 18 : 5 posts by 2 authors. 1 image.
Dattaji Salvi Udyan  Thane
Date: May 13, 2018 ... Altitude: about 11 m (36 feet) asl
Begonia rex  Putz.

Looks different from images on net at
Looks like Begonia imperialis

Thanks ..., many thanks to ... too.
Begonia rex seems to have numerous cultivars - so went on label the posted plant with the name.
However ... suggested ID, Begonia imperialis looks to be more probable and convincing.
Will label it accordingly until it gets validated otherwise.