A few individual flowers surprised us in 2008 by unpigmented areas where there should be crimson pigment.

 On the inside surface of one standard, but nowhere else on that flower, there were small unpigmented patches that tended to be radial in arrangement and only affected the outer half of the petal's radius.

 Incidentally, it is clear from the wing petal in the photograph that the normal pattern of pigment distribution in this seedling is that the colour is strongest in the veins.

 On another stem the flower pigment deficiency was evident on the inside of the wing petals, and by far the most noticeable on the oldest flower, shown at the left here.

 In this case the patches, although most numerous towards the petal edge, were also found right down to the normal white area at the base of the petal.  The patches were smaller than on the standard petal shown above, and lacked a strong hint of radial arrangement.