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Marginal leaf vein
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A leaf vein that runs more-or-less parallel to the margin of a leaf. |
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Marginal placentation
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A type of parietal placentation in which the ovules arise along the margins of the carpel. Compare with laminar placentation; see placentation. |
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Marginate
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Very narrowly winged; e.g., the rachis of the leaf of a number of species of Inga (Fabaceae). Same as alate or winged. |
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Marginicidal dehiscence
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See septicidal and septifragal dehiscence. |
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Marmorate
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Marblelike in appearance. |
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Mata Atlântica
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A Portuguese term referring to rain forest running along the Atlantic coast of Brazil from the state of Rio Grande do Norte to the state of Rio Grande do Sul in a band from 120 to 160 kilometers wide. This band may be interrupted in various places by other types of vegetation. |
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Mauve
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Pinkish blue. |
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Medial longitudinal section
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A cut along the long axis of a flower such that the style is also cut lontidutinally. |
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Medial section
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A cut along the long axis and through the middle of an organ. Compare with longitudinal section. |
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Median
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Of the middle. |
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Medifixed
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Referring to an organ that is attached in the middle. |
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Mega-
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A prefix meaning large. |
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Megagametophyte
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The female gametophyte of angiosperms (flowering plants). Same as embryo sac. |
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Megaphyll
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A leaf with more than one vein; characteristic of ferns, gymnosperms, and flowering plants. See microphyll. |
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Megasporangium (plural = megasporangia)
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A structure in which megaspores are formed. |
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Megaspore
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A spore that develops into a female gametophyte. |
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Megasporophyll
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A leaf bearing a megasporangium. |
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Membranácea, membranáceo
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Que posee la textura de un papel delicado y delgado. |
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Membranaceous
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Having the texture of a thin and delicate paper. |
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Membranaceous
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Having the texture of a thin and delicate paper. |
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Membranous
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Thin and flexible. |
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Mentum
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In some Orchidaceae, a lateral (sometimes nectariferous) projection from the base of the column formed by the fusion of the base of the column and the lateral sepals; common in Scaphyglottis. |
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Mericarp
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One of the units of a schizocarp. The mericarps split from the schizocarp but the mericarps are not dehiscent.. |
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Meristem
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Undifferentiated plant tissue from which new cells arise. |
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Merous
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Referring to a fixed number of parts of a given organ, e.g., a flower that has 5 sepals, 5 petals, etc is 5-merous. |
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