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Gundermann ( Glechoma hederacea ), zygomorphic flower from the front

As zygomorph (from the Greek ζυγόν, zygon, (ox) yoke, and μορφή, morphé, shape), dorsiventral or monosymmetric also enantiomorphic or mirror-symmetrical, bilaterally symmetrical, in botany flowers are referred to, which consist of two mirror-like halves ( bilateral Symmetry ) exist, i.e. have only one plane of symmetry . The different (asymmetrical) structure of the underside and upper side on the body of animals is also called " dorsiventral ".

Zygomorphe blooms occur especially in those plants families , which to certain pollinators are adapted ( Eutropie ), especially when adapted to pollination by bees ( Melittophilie ) and birds ( ornithophily ).

The term was introduced by Alexander Braun around the middle of the 19th century.

Plant families with zygomorphic flowers are, for example, the mint family (Lamiaceae) and the butterflies (Faboideae).

There is only one axis of symmetry in the blossom diagram . In flower formulas , zygomorphic flowers are indicated by a vertical down arrow ( ).


  • 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 , p. 318.

Individual evidence

  1. Dorsiventral . In: Lexicon of Biology . Spektrum Akademischer Verlag, Heidelberg 1999 ( online [accessed October 3, 2016]).
  2. ^ Manfred A. Fischer , Wolfgang Adler, Karl Oswald: Excursion flora for Austria, Liechtenstein and South Tyrol. 2nd, improved and enlarged edition. State of Upper Austria, Biology Center of the Upper Austrian State Museums, Linz 2005, ISBN 3-85474-140-5 .

Web links

Wiktionary: zygomorphic  - explanations of meanings, word origins, synonyms, translations