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The gymnosperms (/ ˈ dʒ ɪ m n ə ˌ s p ɜːr m z,-n oʊ-/ ⓘ JIM-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 ...
The gymnosperms consist of five orders of seed plants: Cupressales, Cycadales, Ginkgoales, Gnetales and Pinales. [a] They developed more than 350 million years ago, long before flowering plants, according to the fossil record. The name comes from the Greek for "naked seed"; the egg cells are not protected by ovaries, as in flowering plants. [4]
Gnetum is a genus of gymnosperms, the sole genus in the family Gnetaceae within the Gnetophyta. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem.
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Ginkgoopsida is a proposed class of gymnosperms defined by Sergei V. Meyen in 1984 to encompass Ginkgoales (which contains the living Ginkgo) alongside a number of extinct seed plant groups, which he considered to be closely related based on similarities of morphology of pollen, seeds, cuticles, short shoots and leaves.
The Gymnosperm Database. Template documentation [ view ] [ edit ] [ history ] [ purge ] This template is a Citation Style 1 wrapper template based on {{ Cite web }} .
Download QR code; Print/export Download as PDF; ... The Gymnosperm Database This page was last edited on 16 August 2024, at 05:58 (UTC). Text is available ...
It is generally mentioned that Parasitaxus usta is the only known parasitic gymnosperm. The species lacks roots and is always found attached to roots identified as of Falcatifolium taxoides (another member of the Podocarpaceae). The first study of the union of P. usta with a host showed anatomical changes typical of a parasite. [2]