Stamen insertion

Stamen insertion describes a stamen's length relative to the corolla tube surrounding it. An inserted stamen is shorter than the corolla tube and stays included within it, as in Datura. An exserted stamen is longer than the corolla tube and projects out beyond its mouth, as in Mimosa and Acacia arabica. Separately, the number of whorls of stamens present in a flower is called stamen cycly, of which there are two major types: uniseriate, a single whorl of stamens, and biseriate, two whorls of stamens; a flower with a stamen count equal to and alternating with the petals (opposite the sepals) is haplostemonous, one equal to but opposite the petals is obhaplostemonous, one with two whorls where the outer is opposite the sepals is diplostemonous (Murraya), one with two whorls where the oute …