Cycadaceae Pers.
  • Syn. Pl. 2: 630. 1807. (Sep 1807)


Cite taxon page as 'WFO (2020): Cycadaceae Pers. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-7000000166. Accessed on: 10 Jul 2020'

General Information

Trees or shrubs evergreen, dioecious, mostly palmlike; trunk columnar, sometimes dichotomously branched at apex, rarely ovoid-bulbous and subterranean, clothed with bases of fallen leaves; bark often thickened and roughened. Leaves borne at apex of trunk, 1(-3)-pinnately compound, spirally arranged; new leaves erect (or somewhat inflexed and appearing coiled in C. multipinnata group), with circinnate leaflets; petiole with spines representing (reduced basal leaflets), rarely unarmed, base swollen and hairy; leaflets numerous, alternate to subopposite, dichotomously branched in a few species, midvein present, margin usually entire. Cataphylls prominent, alternate with leaves, hairy, apex often rigid and pungent. Pollen cones borne at apex of trunk, cylindric or fusiform; microsporophylls numerous, scalelike, spirally and tightly arranged along axis of cone, with numerous microsporangia in groups abaxially; pollen tubes producing 2 motile sperm cells. Megasporophylls several to numerous, somewhat leaflike, alternating with flushes of leaves, arranged in a loose, "conelike" crown surrounding apex of trunk, each with a linear fertile stalk and an apical, pinnatifid or subentire sterile blade; ovules (1 or)2-5 on each side of stalk. Seeds drupelike, somewhat compressed; seed coat 3-layered, consisting of colored sarcotesta, woody sclerotesta, and membranous endotesta. Cotyledons 2, united at base. Germination hypogeal, cryptocotylar. 2n = 22*.

  • Provided by: [C].Flora Of CHina @ efloras.org
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    Morphology

    Males terminal or subterminal, composed of numerous leathery or fleshy flat or peltate scales bearing on the under-surface numerous pollen-sacs

  • Provided by: [A].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
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    Cones dioecious

  • Provided by: [A].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
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    Shrubs or small trees with thick, usually simple stems and a crown of pinnatisect leaves circinate in bud; leaflets often with spiny teeth

  • Provided by: [A].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
    • ]. 

    Female cones similar, the scales bearing a pair of inverted nude ovules on the lower side

  • Provided by: [A].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
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    Seeds large, drupe-like, with copious endosperm; cotyledons 2

  • Provided by: [A].Plants Of the World Online Portal - FWTA
    • Source: [
    • 1
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    Staminate strobilus forming a terminal cone of leathery scales with numerous pollen-sacs on their abaxial surface

  • Provided by: [B].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Leaves usually long and pinnate, in close spirals, forming an often wide-spreading crown on the trunk and (except in one species of Macrozamia) intercalated with leathery scale-leaves

  • Provided by: [B].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Female strobilus either a loose apical whorl of fronds bearing erect ovules marginally (Cycas) or a terminal cone of thick and often woody scales bearing a pair of inverted ovules adaxially

  • Provided by: [B].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Trunk simple or sparsely branched, covered with spirally arranged leaf-bases and scale-leaves, either up to 15 m. tall or very short and almost subterranean

  • Provided by: [B].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Dioecious trees or shrubs

  • Provided by: [B].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Included Genus

     Information From

    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • A The Trustees of the Royal Botanic Gardens, Kew
    Plants Of the World Online Portal - FZ
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    Cycadaceae
    World Flora Online Data. 2017.
    • D CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).