Aril

An aril or aril is a fleshy sheath that surrounds a seed in whole or in part. It is usually formed from the funiculus, the stalk of the ovule. In some species it is interpreted as a remnant of a Sarko Testa. A colored aril is usually the baiting of animals that eat the aril along with seeds and serve as the spread ( Zoochorie ).

Not every fleshy covering of the seed is an aril: The euphorbias, the range of micropyle, the Exostom is meaty - this form is Caruncula or Exostomarillus called.

Examples

Arillusbildung occurs in some families of conifers ( Pinophyta ) before: yew family ( Taxaceae ), Podocarpus plants ( Podocarpaceae ) and head Yews ( Cephalotaxaceae ). The yew (Taxus ) of the aril is the only non-toxic to humans part, it contains no Taxin. Even when ephedra ( Ephedra ), there is a aril.

In the angiosperms Arillusbildungen occur sporadically and may be different. Examples are:

  • For the spiral bushes ( Euonymus ) of the aril includes the seeds completely.
  • In the nutmeg ( Myristica fragrans ) of the aril mace or mace is called and is slashed.
  • The water lilies (Nymphaea ) of the aril is designed as an air-containing sac and serves as a floating bubble.
  • When consumed as a fruit whitish pulp of litchi, mangosteen and longan is Arilli.
  • In poplar the aril is the dry air hair.

Documents

  • Gerhard Wagenitz: Dictionary of Botany. The terms in their historical context. 2nd expanded edition. Spektrum Akademischer Verlag, Heidelberg / Berlin 2003, ISBN 3-8274-1398-2.
  • Peter Sitte, Elmar Weiler, Joachim W. Kadereit, Andreas Bresinsky, Christian Körner: textbook of botany for colleges. Founded by Eduard Strasburger. 35th edition. Spektrum Akademischer Verlag, Heidelberg 2002, ISBN 3-8274-1010- X.
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