cotyledon

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cotyledon

cotyledon , in botany, a leaf of the embryo of a seed . The embryos of flowering plants, or angiosperms , usually have either one cotyledon (the monocots) or two (the dicots). Seeds of gymnosperms, such as pines, may have numerous cotyledons. In some seeds the cotyledons are flat and leaflike; in others, such as the bean, the cotyledons store the seed's food reserve for germination and are fleshy. In most plants the cotyledons emerge above the soil with the seedling as it grows. They differ in form from the true leaves.

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cotyledon

A Dictionary of Plant Sciences | 1998 | | © A Dictionary of Plant Sciences 1998, originally published by Oxford University Press 1998. (Hide copyright information) Copyright

cotyledon A seed leaf that is borne on a plant embryo. Characteristically there is 1 leaf in the monocotyledons, and 2 leaves in the dicotyledons, but there are exceptions, especially in the latter group.

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MICHAEL ALLABY. "cotyledon." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 9 Feb. 2010 <http://www.encyclopedia.com>.

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MICHAEL ALLABY. "cotyledon." A Dictionary of Plant Sciences. 1998. Retrieved February 09, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-cotyledon.html

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