Their life cycle is essentially like that of pine and other conifers. The leaves are broad, with dichotomous venation. Like cycads, Ginkgo is dioecious, having separate male and female plants, The life cycle essentially like that of cycads. We discuss only Welwitschia mirabilis, a very odd plant native to coastal African deserts. The flowering plants are the largest plant group, with over 200,000 species.
Most angiosperms have vessels in their xylem.
The Anthophyta is divided into just two classes, monocots and dicots. Ovules are enclosed by a carpel, which is morphologically a megasporophyll. Pollen is transferred not directly to the ovule, but to the stigma of the carpel. The pollen tube grows through stigma and style to ovary where it enters an ovule through the micropyle. Double fertilization occurs.