Well, this flower is used as a metaphor for Sun. Sun is described as – Japâ-kusuma samkâsam (in Sanskrit), which means, He looks like the Japâ (Hibiscus rosa-sinesis) flower. They said right, as Hibiscus comes in all colors that resemble the sun in different seasons. In Brahma Purâna (one of the 18 great works in Hindu Mythology), sun is said to shine in different colors in every season. While I was reading it, I realized that I almost have all the colors in my Hibiscus-es!
Brahma Purâna says,
(Well, this is the yellow Hibiscus, but looks golden under sun - hope to find the right colored b soon)
Thus Sûrya exists in these colors in every season. According to the conditions of the seasons, Sûrya offers prosperity and abundance of food.”