Aestivation (botany)

A diagram showing some kinds of tepal aestivation in flower buds. A: imbricate; B,C: cochleate; D: contorted; E: valvate; F: open.

Petals of Phlox develop with contorted aestivation

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:

• cochleate
• contorted or twisted — every petal or sepal is outside its neighbour on one margin, and inside its neighbour on the other margin
• contortiplicate
• crumpled
• decussate
• 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
• induplicate
• open - petals or sepals do not overlap or even touch each other
• quincuncial
• reduplicate
• valvate — petals or sepals touch without overlapping

References

1. ^ 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.v · Categories: Flowers Plant morphology Botany stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем решить контрольную работу Cochlearium Cochleosauridae Look at other dictionaries: aestivation — n. summer dormancy (Zoology); manner in which the petals and leaves of a flower bud are arranged (Botany); passing of a summer in a specific place (also estivation) …   English contemporary dictionary aestivation — [ˌi:stɪ veɪʃ(ə)n, ˌɛst ] (US estivation) noun 1》 Zoology prolonged torpor or dormancy of an insect, fish, or amphibian during a hot or dry period. 2》 Botany the arrangement of petals and sepals in a flower bud before it opens. Compare with… …   English new terms dictionary aestivation — /ɛstəˈveɪʃən/ (say estuh vayshuhn) noun 1. Zoology the act of aestivating. 2. Botany the arrangement of the parts of a flower in the bud. Also, estivation. Usage: For spelling variation see ae1 …   open aestivation — noun (botany) Aestivation without overlap or meeting of the edges of the perianth leaves • • • Main Entry: ↑open …   Useful english dictionary Dormancy — During winter dormancy, plant metabolism virtually comes to a standstill due, in part, to low temperatures that slow chemical activity.[1] Dormancy is a period in an organism s life cycle when growth, development, and (i …   Wikipedia estivation — noun 1. (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period • Syn: ↑aestivation • Derivationally related forms: ↑aestivate (for: ↑aestivation), ↑estivate …   Useful english dictionary phytology — noun the branch of biology that studies plants • Syn: ↑botany • Derivationally related forms: ↑phytologist, ↑botanic (for: ↑botany), ↑botanical (for: ↑ …   Useful english dictionary Glossary of botanical terms — Many of the terms used in Wikipedia glossaries (often most) are already defined and explained within Wikipedia itself. However, lists like the following indicate where new articles need to be written and are also useful for looking up and… …   Wikipedia Vernation — (from vernal meaning spring, since that is when leaves spring forth in temperate regions) is the formation of new leaves or fronds. In plant anatomy, it is the arrangement of leaves in a bud. In pine trees new leaves are short and encased in… …   Wikipedia Horn Expedition — The Horn Scientific Expedition was the first primarily scientific expedition to study the natural history of central Australia. It took place from May to August 1894, with expedition members first traveling by train from Adelaide to the railhead… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”