They include ferns and horsetails. Spermatophyte have a reproductive cycle which develops pollen that results in seeds containing the embryo of a new plant. Basically, Gymnosperms have unprotected seeds while Angiosperms have their seeds develop inside a complex structure called the flower. Gymnosperms had their hour of glory in the Jurassic period, around 150 million years ago. Today, they total around 700 species.
Angiosperms are the flowering plants.
Their leaves have parallel veins and their flowers part in multiples of three. Mostly herbaceous plants like grasses, lilies, orchids, they also include also the palm trees growing in warmer climates. Dicotyledons, on the other hand, have two cotyledons coming out of their seeds. Their flowers develop either in multiples of four or five. Half of them are woody plants, including nearly all the deciduous trees, while many others are herbaceous such as mint, thistle, ragweed or strawberry plants, etc. .