#Id: 10762
#XL - R Botany
Aestivation
Valvate :
When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in Calotropis, it is said to be valvate.e.g., Mimosaceae
Twisted :
If one margin of the appendage overlaps that of the next one and so on as in china rose, lady’s finger and cotton, it is called twisted. e.g., Malvaceae
Imbricate :
If the margins of sepals or petals overlap one another but not in any particular direction as in Cassia and gulmohur, the aestivation is called imbricate. e.g., Caesalppinaaceae
Quincuncial :
the margins of two petals are inside and two petals are outside, and one petal's margin is both inside and outside. e.g., Apocynaceae
Vexillary :
In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel)
