EVERYDAY SCIENCE

Detailed explanation-1: -In the obdiplostemonous androecium, there are two whorls of stamens. The outer whorl of stamens is opposite to the petals called antipetalous. The inner whorl of the stamens alternates with petals, called the alternipetalous.

Detailed explanation-2: -Obdiplostemonous condition of stamens occurs when stamens of the outer whorl are opposite the petals and those of the second whorl alternate with the members of the first whorl. The flowers have twice as many stamens as petals, those of the outer set being opposite the petals.

Detailed explanation-3: -Triphasia trifolia, lime berry. Spiny shrub from southeast Asia. Note the glandular-dotted leaves common in the family. This species is obdiplostemonous, meaning it has two whorls of stamens with the outer whorl opposite the petals, a condition common in this and a few other families.

Detailed explanation-4: -obdiplostemonous: in two whorls, with twice the number of stamens as petals, the outer opposite the petals, inner opposite the sepals, e.g. Simaroubaceae (see diagram)

Detailed explanation-5: -Final answer: The whorls of stamens and carpels are called androecium and gynoecium respectively.