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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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Mesic
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Referring to a habitat intermediate in moisture or water supply; i.e., not too dry and not too wet. |
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Mesocarp
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The middle layer of the fruit wall. Compare with pericarp. |
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Mesochile
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The central portion of a complex lip in Orchidaceae. |
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Metabolismo ácido de las Crassulaceae
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Es una manera de fotosíntesis que es característica de las plantas que crecen en agua o ambientes con limitado Dióxido de Carbono. Es más prevalente en especies de Bromeliaceae, Cactaceae, Crassulaceae y Orchidaceae. |
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Metamorphosis
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Change in the morphology and habits of an animal as a part of its normal life cycle, e.g., the changes in a butterfly as it develops from an egg to a chrysalis (= pupa), and finally to an adult or a tadpole that develops into a frog. |
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Mico-heterótrofa, mico-heterotrófica
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Se refiere a una planta heterótrofa que carece de clorofila, vive sobre material orgánico en descomposición y depende de una relación simbiótica con un hongo para obtener su alimento |
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Micro-
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A prefix meaning small. |
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Microgametophyte
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See pollen. |
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Microhabitat
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A specialized habitat usually created by living organisms such as trees; e.g., the habitats found within the crown or along the trunk of a tree. |
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Microphyll
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A leaf with a single vein, characteristic of Lycopodiaceae and Selaginellaceae and not found in the flowering plants. Compare with megaphyll. |
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Micropyle
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An opening in the integuments of the ovule through which the pollen tubes generally penetrate. |
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Micropyle
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An opening in the integuments of the ovule through which the pollen tubes generally penetrate. |
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Microsporangium (plural = microsporangia)
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A structure in which microspores are formed. |
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Microspore
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A spore that develops into a male gametophyte. |
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Microsporophyll
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A reduced leaf bearing one or more microsporangia. |
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Midnerve
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Same as midrib but used less frequently. |
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Midrib
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The primary vein of a leaf, bract, sepal, or petal. Same as costa, midnerve, midvein, and primary vein. |
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Midrib
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Referring to the princiipal or primary vein of a leaf blade that runs from the base of the leaf blade along the middle to the apex of the leaf blade. |
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Midrib plane adaxially
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A midrib rib that is neither salient or impressed toward the base of the adaxial side of the leaf blade, i.e., it is flat with the leaf blade surface. |
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Midrib square abaxially
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A midrib that appears to be square on the abaxial side of the leaf blade. |
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Midvein
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Same as midrib but used less frequently. |
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Mirmecófito
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Se refiere a una planta que tiene una relación simbiótica con hormigas. En las Orchidaceae normalmente se refiere a a la planta que tiene especies específicas de hormigas habitando en las raíces u otras estructuras como el pseudobulbo, e.g. en Calaurthron billamelatum, el pseudobulbo es hueco y habitado por hormigas; en Tococa guianensis (Melastomataceae), la base de las hojas tienen domacios que son habitados por hormigas. |
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Mitra-shaped
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Shaped like a bishop’s hat; i.e., broadest at the base and tapered equally on each side to the apex. |
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Modified steady state phenology
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A flowering strategy in which a few flowers are produced each day over long periods of time but for shorter periods than in steady state species. |
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Monad
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A pollen grain that occurs singly. Compare with tetrad. |
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