Explain twisted aestivation with some examples.
Aestivation
Twisted Aestivation
Write floral formula for a flower which is bisexual, actinomorphic sepals five, twisted aestivation, petals five valvate aestivation; stamens six, ovary tricarpellary, syncarpous, superior, trilocular with axile placentation.
Find out the correctly matched pairs as to aestivation of petals: (i) Valvate-Calotropis, (ii) Twisted-Bean (iii) Imbricate - Cassia (iv) Vexillary-China Rose.