Practice question

Tetradynamous androecium refers to six free stamens arranged in two whorls, four long medial and two short lateral, reflecting cruciform floral architecture of Brassicaceae. Length heteromorphy ensures outcrossing by positioning anthers at different levels relative to stigma and promoting sequential pollen release. Solanaceae possesses five epipetalous stamens, Malvaceae monadelphous indefinite stamens, Fabaceae diadelphous (9)+1. Tetradynamous condition is stable in Brassica nigra, Raphanus sativus and Capsella bursa-pastoris, consistently associated with K2+2 sepals, C4 cruciate corolla, bicarpellary ovary with false septum replum and parietal placentation.