39. The arrangement of ovules within the ovary is known as placentation. What does the term placenta refer to? Name and draw various types of placentations in the flower as seen in T.S. or V.S.


Placenta is a flattened, cushion like tissue on which one or more ovules are attached.

The various types of placentation seen in the flowers are described in the following table


Type of Placentation

Description with example



There is a single placenta which develop along the junction of two fused margins, e.g, pea.


Mutlicarpellary, syncarpous gynoecium inward growth of carpel's margin forms a multicarpellary condition that contains an axis in the centre. Placenta arises from central axis bearing ovules.

e.g., Solanum, Chinarose.


The number of placenta corresponds to number of fusing carpels. Sometimes the ovules bearing placenta grow inward to form false septa and thus ovary becomes bilocular (e.g, mustard) and trilocular

e.g., Curcurbita

Free central

The ovary is unilocular and ovules are borne on the central-axis and not connected to the Ovary wall by septum.

e.g., Dianthus, Silensa.


The ovary is unilocular and the single ovule is borne at the base of the ovary attached by a single placenta,

e.g., sunflower, wheat.