Iris

Iris 'katharine hodgkin'

Today morning, I found an eye-catching flower around entrance of Writtle College. With my bike suspending, I took the picture. The name is
Iris 'katharine hodgkin' (Reticulata Group)

Very tiny bulb plant. A contrast of blue and yellow is quite rare in the nature. As you see below, the yellow colour is rather strong.

Identifying 5 colours

5 points on colour wheel