Ascending imbricate corolla is found in

Papilionadeae is characterized by vexillary aestivation wherein one margin of the two lateral petals is overlapped by the posterior petal. Another margin of these two lateral petals overlaps the two anterior petals that are united. The united anterior petal form keel or carina. Here the odd petal or the largest one is posterior and thus, the aestivation is descending imbricate
The Caesalpinioideae exhibits imbricate aestivation in which margin of petals overlap each other in irregular fashion. It is characterized by presence of 5 sepals and the anterior sepal is odd one.
Mimosae and Solanaceae exhibit valvate aestivation wherein margins of adjacent petals or sepals just touch each other without overlapping.