Characteristic of flower in P. dasycaulon . A. Flower bud at various stages of development. The last figure shows a flower at the time of anthesis. B. A single petal excised from the flower after anthesis. C. Figure showing stamens and pistil 4 hour after anthesis after removing all other floral parts. D. Anthers removed from a single flower at anthesis. E. An excised pistil showing stigma, style and ovary. Note luxurently growing papillate hairs at the basal region of the ovary. F. Pollen sterility assessed by acetocarmine staining. Arrows indicate the sterile pollens.