(1) Polypetalae: The flowers contain distinct non-essential whorls calyx and corolla. In the corolla petals are free.
This sub-class includes 3 series:Thalamiflorae, Disciflorae and Calyciflorae.
- Series Thalamillorae: Many stamens in the androecium. Flower is hpognous.
- Series Disciflorae: I Hvpog-nous flowers with a cushion-like disc around orbelow the ovary.
- Series Calyciflorae: Flowers epigvnous or pcrigynous. Thalamus is in theform of a cup.
(2) angiosperms: The angiosperms and the gymnosperms are part of the kingdom of plants. Angiosperms are generally considered as flowering plants while the gymnosperms are those that are known as the ancestors of angiosperms. The major difference that often defines these plants is the seeds that it contains. The angiosperm seeds are coated within the fruits.
