It is a wild flower normally found after the monsoon season in Kerala.
It is a beauty in ballerina's dress code. Its white petal is smoother than silk.
I don't know the exact name. In my native place, in Malabar, people call it Channa Koova. It is a typical 'Koova' - a medicinal plat . I have n't heard anybody uses this thing. Normal koovas don't flower like this. The roots of Koova plant are used as medicine. It looks like turmeric plant. Turmeric is also a Koova family memeber, if I am not mistaken.
After posting this in June 2011 - in Oct.2011 I got a comment !
Meanwhile I also found out some new info. about this plant - it is called Crepe Ginger and it is edible. It is widespread in many countries and has varieties. Because elephants like this in Kerala it is also known as Ana ( Elephant) koova.
Anyway this 'Channa Koova' has a special place ( :) ) in the Mallu world..it is a Malayalam Spoonerist's delight !!