- Aestivation (botany)
Aestivation or estivation, refers to the positional arrangement of the parts of a flower within a flower bud before it has opened. Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation: the arrangement of leaves within a vegetative bud.
Aestivation can be an important taxonomic diagnostic; for example Malvaceae flower buds have valvate sepals, with the exception of the genera Fremontodendron and Chiranthodendron, which have sometimes been misplaced as a result.
The terms used to describe aestivation are the same as those used to describe leaf vernation. Classes of aestivation include:
- contorted or twisted — every petal or sepal is outside its neighbour on one margin, and inside its neighbour on the other margin
- imbricate — where one petal or sepal is outside all others, one is inside all others, and the others are outside on one margin and inside on the other
- open - petals or sepals do not overlap or even touch each other
- valvate — petals or sepals touch without overlapping
- ^ Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms.. Cambridge: Cambridge University Press,.
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