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Question
Describe the arrangement of floral members in relation to their insertion on thalamus?
Solution
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| (a) Hypogynous | (b) & (c) Perigynous | (d) Epigynous | |
- Hypogynous: In the hypogynous flower, the gynoecium occupies the highest position, while the other parts are situated below it. The ovary in such flowers is said to be superior, e.g., mustard, china rose, and brinjal.
- Perigynous: If the gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus, almost at the same level, it is called perigynous.
- Epigynous: In epigynous flowers, the margin of the thalamus grows upward, enclosing the ovary completely and getting fused with it; the other parts of the flower arise above the ovary. Hence, the ovary is said to be inferior, as in the flowers of guava and cucumber and the ray florets of sunflower.
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