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Placenta incipient
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A type of placenta which is barely expanded from the septum as seen in medial longitudinal section. |
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Placenta laminar
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A placentation type in which the ovules are attached to laminae that run vertically through much of the ovary as seen in medial longitudinal section. |
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Placenta oblique
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A type of placentation in which the placenta is derived from a short, horizontally expanded lower septum that expands at a right angle to the upper septum and may be slightly upward and outward oriented at its end as seen in medial longitudinal section. |
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Placentación apical
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Tipo de placentación en la que los óvulos están unidos al ápice del lóculo. Ver placentación. |
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Placentación axilar
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Tipo de placentación en la que los óvulos nacen de un septum central o axilar del lóculo. Ver placentación. |
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Placentación basal
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Tipo de placentación en la que los óvulos nacen de la base del lóculo. Ver placentación. |
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Placental obturator
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A massive outgrowth of the placenta. In the Styracaceae, the micropyle of each ovule opens upon an obturator; the obturators may or may not be connate. |
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Placental unit
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The smallest continuous part of the placenta to which ovules are attached. |
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Placentation
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In broadest terms, the arrangement of ovules within the ovary. See axile, basal, free-central, and parietal placentation. |
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Placentation
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In broadest terms, the arrangement of ovules within the ovary. The most basic type of placentation classifies species as having parietal, axile, or free-central placentation. |
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Placentation basal
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A type of placentation in which the ovule is attached to the floor of the locule. |
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Placentation bilamellar
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A type of placentation that runs the length of the locule with two rows of ovules attached to two lamellae. |
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Placentation free-central
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A type of placentation in which the ovules are borne on a central column arising from the base of a unilocular ovary. |
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Plagiotropous
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Referring to a growth habit in which the growing apex is oriented horizontally. Compare with orthotropous. |
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Planalto
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A Portuguese and Spanish word referring to a flat area usually at elevations; e.g., the planaltos of central Brazil and in Andean valleys. |
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Planar
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Flat. |
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Plane
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Flat, even, level; i.e., without any projections; usually referring to leaves with veins at same level as in a leaf blade surface. |
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Plane
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Referring to a structure that is flat, even, or level with the surface of the structure in which it occurs; i.e., without projectiing above the surface of an organ. |
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Plank buttress
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A flattened, board-like buttress. |
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Plano-compressed
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Compressed such that the sides are flat. |
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Plano-convex
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Flat on one side and curved outward on the other; often refers to cotyledons. |
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Plant holder for photography
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Devices, such as those shown here, can be used to secure plants in fixed positions to make it easy to photograph them. Note that the alligator clamp at the end of a flexible wire can either be attached to a branch or the base can be coiled into a circle and the device placed on the ground or another object. For more information about plant collecting see Tropical Plant Collecting: From the Filed to the Internet. This book can be purchased at: http://tecceditora.com/ or Amazon.com. |
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Plant holders for photography
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Devices used to hold specimens of Lecythidaceae in place for photography. |
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Plant succesion
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The sequence of plant communities that follows after natural or human disturbance. |
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Plantas en cojín
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Forma de crecimiento de algunas plantas, usualmente en elevadas altitudes, en la que los numerosos tallos se encuentran muy juntos y de manera congestionada formando una estructura parecida a una almohada o almohadilla. |
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Pleio-
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A prefix meaning more. |
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Pleiochasium
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Referring to a cyme in which each of the main axes produces more than two branches. |
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Pleionanthy (pleionanthic, pleionanthous)
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Referring to plants that flower repeatedly; i.e., those that do not die after a single flowering. Same as polycarpous and iteroparous; opposite of hapaxanthic and monocarpic. |
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Pleiothyrse
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A complex thyrse; e.g. those of some species of Apocynaceae subfamily Asclepiadoideae. |
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Pleisiomorphic
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Referring to a feature of a plant that is an ancestral character state; i.e., an evolutionarily primitive character state that does not help define taxonomic groups. |
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Pleurogram
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A line or crack, sometimes shaped like a horseshoe, found on the lateral faces of the seed coat of some legumes. |
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Pliant
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Flexible. |
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Plicate
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Folded into lengthwise plaits, like a fan. |
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Plinervada
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Se refiere a una disposición de los nervios en las hojas, en la que el nervio medio o principal está longitudinalmente acompanado por varios otros nervios secundarios similares que nacen en la base de la hoja o cerca de ésta; por ejemplo, en muchas Ericaceae o algunas Euforbiaceae |
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Pliveined (plinerved)
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Referring to leaf blade venation in which the midvein is accompanied by several nearly equal secondary veins arising at or near the base; e.g., in many Ericaceae and some Euphorbiaceae. |
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Plot sampling
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— |
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Plumosa
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Que tiene pelos con apariencia de plumas |
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Plumose
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Feathery or bearing featherlike hairs or bristles. |
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Plumule
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The upper portion of the embryo that develops into the primary shoot. |
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Pneumatophore
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An erect, aerial breathing root found in species of wet habitats such as mangrove swamps. |
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Pneumatophore
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An erect, aerial breathing root found in species of wet habitats such as mangrove swamps and along periodically inundated river banks. |
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Pock marks
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A non technical term used to describe small circular depressions on the external surface of bark. |
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Pod
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The most common fruit of the Fabaceae; see legume. |
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Polar nuclei
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Two nuclei that migrate to the center of the embryo sac and fuse with a male nucleus (sperm) to form the primary endosperm nucleus which divides and sometimes forms the endosperm. |
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Polen colporado
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Se aplica a un grano de polen con aberturas compuestas, cada una consiste de un surco y un poro. |
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Polen diferenciado
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Equivalente a polen para alimento |
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Polen para alimento
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Polen que no germina y que sólo sirve como recompensa para el polinizador. Esto ha sido demostrado en Couroupita guianensis y Lecythis pisonis (Mori et al., 1980) e hipotéticamente se considera que también sucede en otras especies que poseen estaminodios en el interior de una capucha plana o en los estambres de un anillo estaminal que están en el lado ligular |
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Polinario
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En las Orchidaceae, es la estructura que porta el polen. Está compuesto por el viscidio, estipe y polinios |
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Polinio
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Una masa de polen agregado que es característico de las Orchidaceae y de las Apocynaceae de la subfamilia Asclepiadoideae. |
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Polinización cruzada
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Polinización de las flores con un polen procedente de una flor de una misma especie pero proveniente de otra planta. |
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