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The fossil record of gymnosperms includes many distinctive taxa that do not belong to the four modern groups, including seed-bearing trees that have a somewhat fern-like vegetative morphology (the so-called "seed ferns" or pteridosperms). [27] When fossil gymnosperms such as these and the Bennettitales, glossopterids, and Caytonia are ...
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]
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 ...
A mature female big-cone pine (Pinus coulteri) cone, the heaviest pine cone A young female or seed cone on a Norway spruce (Picea abies) Immature male or pollen cones of Swiss pine (Pinus cembra) A conifer cone or, in formal botanical usage, a strobilus, pl.: strobili, is a seed-bearing organ on gymnosperm plants, especially in conifers and cycads.
Birds of the crow family, Corvidae, are the primary distributor of the conifer seeds. These birds are known to cache 32,000 pine seeds and transport the seeds as far as 12–22 km (7.5–13.7 mi) from the source. The birds store the seeds in the soil at depths of 2–3 cm (3 ⁄ 4 – 1 + 1 ⁄ 4 in) under conditions which favor germination. [27]
The male cones are cylindrical, 3–5 mm long, with 2-3 together at the end of side branches. Female cones occur in groups of 3–4 in short, stalked clusters at the axils or margins of the cladodes. Mature cones are a distinct fleshy pink to red, with a white aril holding a hard, black, exposed seed. [2]
At the conclusion of its sixth rate-setting policy meeting of 2024 on September 18, 2024, the Federal Reserve announced it was lowering the federal funds target interest rate by 50 basis points to ...
Conifers (8 C, 26 P) Cycads (5 C, 19 P) G. Ginkgophyta (1 C, 16 P) ... Pages in category "Gymnosperms" The following 4 pages are in this category, out of 4 total.
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