Answer:
The mode of arrangement
of petals or sepals in a flower bud with respect to the membersof the same
whorl or with each other is known as aestivation. It is of following types
Valvate Margin of adjacent petals or sepals touch each
other, but do not overlap, e.g., mustard (Brasslca).
Twisted Regular
overlapping of petals or sepals occurs in which margin of one petal overlapwith
the adjacent next one petal, e.g., China rose (Hibiscus rosasinensis).
Imbricate
There are five petals arranged in such a way that one petal is completely
external and one petal is completely internal, three petals are partially
external and partially internal, e.g., Cassia, Callistemon, Caesalpinia.
Quincuncial There
are five sepals or petals of which two are completely out and two arecompletely
inside, while one is partially out and partially in e.g., Cucurbita
(Cucurbitaceous).
Vexillary It
is the characteristic aestivation of corolla of family - Papilionaceae, in
which corolla (petals) are papilionaceous.
The largest
overlap the two lateral petals (wings), which in turn overlap the two smallest
anterior petals (keel) e.g., Artobotrys, Polyalthea, Pisum.
(a)Valvate, (b)Twisted, (c)
Imbricate, (d) Quincuncial and
(e) Vexillary
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