Raghuji, Datura you are talking about may be Datura Ferox which is a small herb with broadly ovate sinuate leaves & flowers on stout axillary peduncles. It is found in plains.
The pictures I have posted are of Datura arborea also called as Angle's Trumpet. It has ovate leaves with flowers on drooping axillary peduncles.This plant is endemic to Chilli & Mexico. In Maharashtra it is found in hilly areas like Mahabaleshwar & Khandala-Lonavala.