cycad


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cycad

(sī`kăd), any plant of the order Cycadales, tropical and subtropical palmlike evergreens. The cycads, ginkgoesginkgo
or maidenhair tree,
tall, slender, picturesque deciduous tree (Ginkgo biloba) with fan-shaped leaves. The ginkgo is native to E China, where it was revered by Buddhist monks and planted near temples; it is unclear if any truly wild stands still exist.
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, and conifersconifer
[Lat.,=cone-bearing], tree or shrub of the order Coniferales, e.g., the pine, monkey-puzzle tree, cypress, and sequoia. Most conifers bear cones and most are evergreens, though a few, such as the larch, are deciduous.
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 comprise the three major orders of gymnosperms, or cone-bearing plants (see conecone
or strobilus
, in botany, reproductive organ of the gymnosperms (the conifers, cycads, and ginkgoes). Like the flower in the angiosperms (flowering plants), the cone is actually a highly modified branch; unlike the flower, it does not have sepals or petals.
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 and plantplant,
any organism of the plant kingdom, as opposed to one of the animal kingdom or of the kingdoms Fungi, Protista, or Monera in the five-kingdom system of classification.
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). The cycads first appeared in the Permian period. They are the most primitive of the living seed-bearing plants and in many ways resemble the fernsfern,
any plant of the division Polypodiophyta. Fern species, numbering several thousand, are found throughout the world but are especially abundant in tropical rain forests. The ferns and their relatives (e.g.
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. Some have tuberous underground stems, with the crown of leathery, glossy, fernlike leaves springing from ground level; others have a columnar stem, usually 6 to 10 ft (1.8–3.1 m) high (though the corcho of Cuba reaches 30 ft/9.1 m), and are often mistaken for palms. There are 11 genera composed of less than 150 species, some found in very restricted areas. Many cycads (e.g., the fern palm of the Old World tropics and the nut palm of Australia) bear poisonous nutlike seeds. The pith of the coontie (Zamia floridana) yields a starch called Florida arrowrootarrowroot,
any plant of the genus Maranta, usually large perennial herbs, of the family Marantaceae, found chiefly in warm, swampy forest habitats of the Americas and sometimes cultivated for their ornamental leaves.
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 or sagosago
[Malay], edible starch extracted from the pithlike center of several E Asian palms (chiefly Metroxylon sagu) or sometimes of cycads. The starch is an important item in the diet in some parts of E Asia and is exported for use in foods (e.g.
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; the coontie is often called sago palm. Cycads are grown as ornamentals in warm regions and in greenhouses. The cycads are classified in the division PinophytaPinophyta
, division of the plant kingdom consisting of those organisms commonly called gymnosperms. The gymnosperms, a group that includes the pine, have stems, roots and leaves, and vascular, or conducting, tissue (xylem and phloem).
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, class Cycadopsida.
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References in periodicals archive ?
The oldest among the selected eight Taitung Cycads is the 146-year-old, which is located in Lijia Elementary School.
Cracknell then contacted Cycad International as they were aware that the latter was exporting the Australian baobab Adansonia gregorii.
The question then arises: What type of strategies are required to improve the conservation status of cycads? The concept of taking an integrated conservation approach for cycad species was presented at the 9th International Conference of Cycad Biology (Pritchard et al., 2011).
This new record of the presence of Anatrachyntis on a Neotropical species of cycad suggests that they may be predisposed to feeding on this uniquely toxic host tissue, and that further surveys may find members of this genus associating with species throughout the Cycadales.
Demographic variation in cycad populations inhabiting contrasting forest fragments.
Buyer: Temasek Holdings (Private) Ltd, Polaris Partners, Flagship Ventures, Vertex Venture Holdings Ltd , Merck Research Labs Venture Fund, Cycad Group , Alexandria Venture Investments , Omega Funds
His research led him to the story of Fossil Cycad National Monument, a real-life example of a park that was decommissioned after visitors lifted so many of the fossils from the surface that there were none left to protect.
She wrote, "I had the good fortune to see many butterflies in a frenzy to mate and some females were also laying eggs on [one of several potted] cycad plant[s].
In their review, Bonta and Osborne found that the Indigenous names for many cycad species had been richly documented.
then a neurotoxicologist at the Albert Einstein College of Medicine, briefly resurrected the BMAA hypothesis and reported shaking and paralysis in macaques fed BMAA, (9) but his work was heavily criticized by another team of neurologists that argued that people would have to eat kilograms of cycad flour to ingest a comparable dose.