Lantana Flowers

We have about a dozen Lantana plants in the greenhouse and they have been flowering all summer. As far as I can tell they are all the same species or at the very least are closely related. The flowers are all different colours including red, orange, yellow, pink, purple, white, and any combination there of. In some cases it looks like the same plant has a several different colours of flowers. This may be the result of several plants in the same pot. This variety is growing in the local Municipal Gardens and is one of my favourites. Below are some photos of the flowers from the greenhouses. Even the structure of the flower varies.