What is Seed plants?
[[File:קיבוץ בית אורן 2 2010 (25).JPG|thumb|Seed plants]] '''Seed plants''' are a group of [[plant]]s. [[Gymnosperm]]s and [[angiosperm]]s form the group. Their [[seed]]s have three parts: (1) an [[embryo]], (2) a supply of [[nutrient]]s for the embryo, and (3) a seed [[coat]]. They are also called '''spermatophytes''' or '''phanerogams'''. The seed plants dominate almost all the [[environment]]s on land. The living spermatophytes are in five groups: *[[Cycad]]s, a subtropical and tropical group of plants with a large crown of compound leaves and a stout trunk *''[[Ginkgo]]'', a single living species of [[tree]] *[[Conifers]], cone-bearing trees and [[shrub]]s *[[Gnetophyta]], woody plants in the genera ''[[Gnetum]]'', ''[[Welwitschia]]'', and ''[[Ephedra]]'' *[[Angiosperms]], the flowering plants, a large group including many familiar plants in a wide variety of habitats The [[fossil]] [[seed fern]]s ([[Pteridospermatophyta]]) were one of the earliest successful groups of land plants. Forests dominated by seed ferns were common in the [[Permian]]. ''[[Glossopteris]]'' was a widespread [[tree]] [[genus]] in the ancient southern [[supercontinent]] of [[Gondwana]] in the [[Permian]] period. By the [[Triassic]] period, seed ferns had declined, and modern gymnosperm groups were abundant. Gymnosperms were dominant to the [[Upper Cretaceous]], when the angiosperms [[adaptive radiation|radiated]]. Angiosperms are the most common plants today, though there are still large pine forests in the [[Northern Hemisphere|northern hemisphere]]. == Related pages == *[[Seed]] [[Category:Plant taxonomy]] [[Category:Seed plants]]