placentation

[ plas-uhn-tey-shuhn ]

Phonetic (Standard)IPA

noun

Anatomy, Zoology.
1. the formation of a placenta.
2. the manner of placement or construction of a placenta.
Botany. the disposition or arrangement of a placenta or placentas.

placentation

/ ˌplæsɛnˈteɪʃən /

botany the way in which ovules are attached in the ovary
zoology
1. the way in which the placenta is attached in the uterus
2. the process of formation of the placenta

From French, dating back to 1750–60; placenta, -ation

To Santalaceæ they approach in processes, valvate corolla, and placentation, also to Loranthaceæ.

In the flowers of Saponaria officinalis Dr. Masters has observed instances of both marginal and free central placentation.

The disjunction or dialysis of the carpels, for instance, frequently renders axile placentation marginal.

In double flowers of Primulaceæ similar alterations in the placentation may often be observed.

The same excellent observer has recorded the occurrence of free central placentation in malformed flowers of Trifolium repens.

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