Placenta oblique
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Title
Placenta oblique
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Definition
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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Notes
When viewed in cross section, each of the placentae in the adjacent in the adjacent locules of the 2-locular ovary appear like trees with the crowns on the outer end of the septum, a positions that contrasts with other placentation types in which the placentae are attached to the inner end of the septum. When the placentae of the adjacent locules are considered as a unit, they appear dumbbell-shaped, i.e., the two spreading "crowns" (the weights) are attached to one another by a handle. This type of placenta differs from all others by developing toward the outside of the locule; in contrast, other types Lecythidaceae develop at the apices of the septum. Oblique placentae are only found in the two clades of Eschweilera, i.e., the E. integrifolia and the E. parvifolia clades.
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Related Terms
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