(from the article `flower`) ...especially if the axis is elongate. There are commonly four distinct whorls of flower parts: (1) an outer calyx consisting of sepals; within it ... Stamens (microsporophylls) are structures that produce pollen in terminal saclike structures (microsporangia) called anthers. The number of stamens ... [2 r... Found on http://www.britannica.com/eb/a-z/a/72