This flower is commonly called the Shoe Flower – I always wondered why till I read ( just now!) that the flowers were traditionally used to polish shoes in Jamaica and some African countries
The flowers are conspicuous and showy and are have five or more petals.
The hibiscus petal is was used to stimulate thicker hair growth and to prevent premature graying, hair loss and scalp disorders.
I do not know if this is the sleeping hibiscus or one which is not fully bloomed.
Both these were photographed at the Mahalaxmi Race Course, Mumbai
And another one at Sainikpuri