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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/07/13 08:37:32」(JST)

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A diagram showing some kinds of petal or sepal aestivation in flower buds. A: quincuncial; B,C: cochleate; D: contorted; E: valvate; F: open.

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.^[1] Classes of aestivation include:

imbricate – overlapping
- contorted or twisted – every petal or sepal is outside its neighbour on one margin, and inside its neighbour on the other margin
  - cochleate – spirally twisted
  - contortiplicate – contorted and also plicate
- quincuncial – with five parts, where two petals or sepals are outside all others, two are inside all others, and the fifth is outside on one margin and inside on the other
crumpled
decussate
induplicate – folded inwards
open – petals or sepals do not overlap or even touch each other
reduplicate – folded outwards
valvate – margins of adjacent petals or sepals touch each other without overlapping.

Lilac (Syringa vulgaris), valvate aestivation
Phlox (Phlox paniculata), contorted aestivation
Vinca minor, contorted aestivation
Ipomoea, contortiplicate aestivation
The corolla of Merremia tuberosa was contortiplicate in the bud

References

^ Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. Cambridge: Cambridge University Press,.

This botany article is a stub. You can help Wikipedia by expanding it.

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[1] Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. Cambridge: Cambridge University Press,.

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