Describe various types of aestivations with the help of suitable examples.

Describe various types of aestivations with the help of suitable examples.
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Ans: Arrangement of perianth lobes in bud condition is called as aestivation. They are of the following types.

I. Valvate: Perianth lobes of cycle are arranged side by side but not overlapped. Ex: Calyx of Hibiscus and Datura.

II. Twisted: It is also known as contorted or convolute aestivation. In this each perianth lobe has one overlapped and one underlapped margin. Ex: Corolla of Datura and Hibiscus.

III. Ascending imbricate: In this the overlapping of perianth lobes is from anterior to posterior with one anterior one completely outside, three of them with one margin inside and one margin outside and the posterior odd one completely inside. Ex: corolla of Caesalpiniaceae.

IV. Descending Imbricate: In this the overlapping of perianth lobes is from posterior to anterior. Ex: Corolla of Fabaceae.

V. Quincuncial: It has one opposite pair of perianth lobes completely inside, one opposite pair completely outside and the remaining one has one margin inside and one margin outside. Ex: Calyx of Ipomoea and Catharanthus. 
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