Bi-colour Flowers

As far as i know, almost all flowers have one colour each. In my garden, i have one Rangani (Ixora Coccinea) plant which contains two colours, red and yellow. Common rangani flowers are of scarlet colour. I have one variety of rangani on which the dominant colour is yellow and on it there are small dots of red. I have a fourth variety of rangani which is partly yellow and partly red.

Here are the four varieties:

The surprising fact is that these flowers with different colours blossom on the same plants.

I have six varieties of Mandar (Jaba Kusuma – China rose, coral tree, Hibiscu Rosa Sinensis) flower – the common red one, a pink one, another white and yet another pinkish yellow. I have observed that the mandar plant which almost always bears white flowers sometimes surprises me with pink flowers! The fifth variety is Lanka Mandar; it is called ‘lanka’ because it looks like a ripe red chilli. And the sixth one is 'pentha' (bunch) mandar. Here they are:

There is yet another variety, the seventh one - that bears common red flowers but its leaves have patches of white. Here is a sample:

Yesterday, there was a big surprise for me in the garden. On one mandar plant which always bears pinkish yellow flowers, had blossomed one bi-colour flower – half pinkish yellow and the other half bright red!!!

Here it is:

I do not know whether the pinkish yellow mandar is of a hybrid variety and whether the subdued red strain had suddenly made its presence felt!

And then why does the mandar plant which bears white flowers very occasionally brings out a pink-coloured flower? 

POST-SCRIPT: 09.04.2015

There was a second surprise today. The plant which normally bears pinkish yellow flowers and which had borne a bi-colour flower, had a fully red flower today. Here it is:

How difficult it is to fathom nature's creativity!!