This article is about the positional arrangement of the parts of a flower within a flower bud before it has opened. For other uses, see Aestivation (disambiguation).
Aestivation or estivation is 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.
A diagram showing some kinds of petal or sepal aestivation in flower buds. A: quincuncial; B: twisted, C: cochleate; D: contorted; E: valvate; F: open.
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.
Terminologyedit
The terms used to describe aestivation are the same as those used to describe leaf vernation.[1]
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.
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.
vexillary – a special type of aestivation occurring in plants like pea; in this type of aestivation a large petal called standard encloses two smaller petals.
aestivation, botany, this, article, about, positional, arrangement, parts, flower, within, flower, before, opened, other, uses, aestivation, disambiguation, aestivation, estivation, positional, arrangement, parts, flower, within, flower, before, opened, aestiv. This article is about the positional arrangement of the parts of a flower within a flower bud before it has opened For other uses see Aestivation disambiguation Aestivation or estivation is 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 A diagram showing some kinds of petal or sepal aestivation in flower buds A quincuncial B twisted C cochleate D contorted E valvate F open 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 Terminology editThe terms used to describe aestivation are the same as those used to describe leaf vernation 1 Classes of aestivation include crumpled decussate 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 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 vexillary a special type of aestivation occurring in plants like pea in this type of aestivation a large petal called standard encloses two smaller petals nbsp Lilac Syringa vulgaris valvate aestivation nbsp Phlox Phlox paniculata contorted aestivation nbsp Vinca minor contorted aestivation nbsp Ipomoea contortiplicate aestivation nbsp The corolla of Merremia tuberosa was contortiplicate in the bud References edit Hickey M King C 2001 The Cambridge Illustrated Glossary of Botanical Terms Cambridge Cambridge University Press nbsp This plant morphology article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Aestivation botany amp oldid 1171332895, wikipedia, wiki, book, books, library,
