Category: P
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Plectostele
(In Lycopodium) protostele which in tranverse section appears as alternating bands of xylem and phloem.
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Pleated
With parallel folds, folded like a fan along many ribs. When young, as in a leaf, folded several times along the length.
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Plant taxonomy
The science whose practitioners (find), describe, classify, identify and name plants.
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Plantlet
Small plant formed on the leaf of a ‘mother’ plant.
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Plano-convex
Flat on one side, convex on the other. (Of cap) Convex with a flat disc, or central area.
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Plane
Flat, level, even. (Of cap) Flat, or nearly so, not curved. A flat surface, especially that of the body seen from a specific angle. A level or smooth surface, especially any of the hypothetical flat surfaces, orientated in various directions, used to divide the body; for example, the coronal and sagittal planes.
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Plagiotropic
(Of shoots) lateral branches, ± horizontal or at an angle from the vertical.
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Placentation
Disposition of the placenta within the ovary. In botany, the arrangement of the placentas and ovules within the ovary. The process of formation and attachment of the placenta. How the placenta forms and attaches.
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Placenta
The part of the ovary to which the ovules or seeds are attached, sometimes raised or thickened. That surface or part of an ovary to which the ovules are attached. The disk-shaped organ within the uterus through which the exchange of nutrient material and oxygen takes place along with the elimination of waste products from…
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Pitted
With small depressions. Covered with small cavities. Having small depressions upon the surface. Covered with small hollows.