Microdissection of the flower reveals the early style and anthers are green in colour. Even from an early stage, the style surface is indented. The individual loculi of the anthers are obvious
Microdissection of an early flower shows that the developing petals carpel and anthers are green in colour. These later develop a purple pigment.
The outer buds are growing and slightly pigmented at the point of folding. The phyllaries are still visible.
In the taller flower nearest the camera has begun to pigment. The out of focus flower with the shorter stalk is less developed
More pigment has accumulated in the marignal petal buds
The buds have begun to outgrow the pappus bristles. The visible hairs emerging from the phyllaries are largely long and straight
The outer, or marginal, flower buds are always first to open.
At the time
when opening begins, the marginal buds are not fully pigmented
The petals have a gradient of pigmentation as they open and are more pigmented at the base. Very soon after the stamen filaments straighten the anthers begin to open, the unpigmented pollen becomes visible.
Most of the outer florets have opened in this flower. As ye,t some of the stamen filaments are still not yet straight and the anthers are closed
Some of the outer buds have yet to open. Those that done so have just begun to produce pigment.
The next ring of smaller white disc flowers has begun to open. Differnet stages in the maturation of the stamen can be observed. Note that the first anthers have already begun to be shed.
central florets become a little pigmented close to the tips of the outer petal. The other petals change from being white to green
The inner petals of the central florets are white. A few flat and dehydrated pollen grains are adherent to the phyllary hairs.
As the florets open, the pigmented anthers and carpel become visible. At this stage, the anthers filaments are bent over. A small insect has already entered a flower.