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The name comes from the Greek for "naked seed"; the egg cells are not protected by ovaries, as in flowering plants. [4] Gymnosperms are divided into 12 families of trees, shrubs and woody vines. [5] Sequoiadendron giganteum, the giant redwood, is the largest tree in the world, and Sequoia sempervirens, the coastal redwood, is the tallest. [6]
The gymnosperms (/ ˈ dʒ ɪ m n ə ˌ s p ɜːr m z,-n oʊ-/ ⓘ nə-spurmz, -noh-; lit. ' revealed seeds ') are a group of woody, perennial seed-producing plants, typically lacking the protective outer covering which surrounds the seeds in flowering plants, that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae [2] The term gymnosperm comes from the ...
As a class, they may be called Pinopsida or Coniferae. As an order they may be called Pinales, Coniferae, or Coniferales. Conifers are the largest and economically most important component group of gymnosperms, but nevertheless they comprise only one of the four groups.
Gnetophyta (/ n ɛ ˈ t ɒ f ɪ t ə, ˈ n ɛ t oʊ f aɪ t ə /) is a division of plants (alternatively considered the subclass Gnetidae or order Gnetales), grouped within the gymnosperms (which also includes conifers, cycads, and ginkgos), that consists of some 70 species across the three relict genera: Gnetum (family Gnetaceae), Welwitschia (family Welwitschiaceae), and Ephedra (family ...
The gymnosperms include conifers, cycads, gnetales and ginkgos and these may have appeared as a result of a whole genome duplication event which took place about 319 million years ago. [97] Ginkgophyta was once a widespread diverse group [ 98 ] of which the only survivor is the maidenhair tree Ginkgo biloba .
The extant spermatophytes form five divisions, the first four of which are classified as gymnosperms, plants that have unenclosed, "naked seeds": [1]: 172 Cycadophyta, the cycads, a subtropical and tropical group of plants, Ginkgophyta, which includes a single living species of tree in the genus Ginkgo,
The Gymnosperm clade — in plant taxonomy; Subcategories. This category has the following 8 subcategories, out of 8 total. Gymnosperm genera (3 C, 3 P) ...
This category should contain only articles about the orders of gymnosperms, when the articles are at the scientific name, or redirects from the scientific name in the case of monotypic taxa or articles at the English name.