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cycad |
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cycad a member of the plant genus of cycas, dioecious, non-flowering woody plants (gymnosperms) which produce seeds in a woody cone consisting of exposed seed leaves (sporophylls), not enclosed in an ovary. The leaves are usually in a rosette at the top of the stem, which may be subterranean. Include Bowenia, Cycas, Dioon, Encephalartos, Lepidozamia, Macrozamia, Zamia spp. cycad glycoside group of glycosides including cycasin, macrozamin, found in cycad plants; oxidized in vivo to release toxin methylazoxymethanol (MAM). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The Podocarpus and cycad families are ancient relatives of conifers -- pines, junipers, cypresses, firs, and redwoods. It has been proposed that this syndrome of parkinsonian dementia is related to the consumption of flour made from cycad seeds (Spencer 2003) or to inhalation of pollen from cycad plants (Seawright et al. Mati Ke (northern Australia)--a marri: a kind of cockroach that lives in dead cycad fronds. |
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