Gynostegium
The Gynostegium also Stylotegium , Gynandrium or stamp, stylus cover, hood is a head-like, complex structure in the flowers of the silk plant family (Asclepiadaceae), which covers the Gynoeceum . It is formed from the fused scars of two closely fitting pistils with mostly free styluses and the fused anthers attached to them and glued together . Special pollinia are formed. The whole structure is also seen as a single stamp.
It is often surrounded by a secondary crown (corona, corona scales), which consists of the bag-shaped, cap-shaped and often toothed, horned appendages of the stamens (staminal); there may also be another secondary crown (interstaminal), as in Stapelia flavopurpurea .
Historically Gynostegium was originally a generic term for the perianth used similar to that used today perianth . It has been used almost exclusively in its current sense since the early 19th century.
The gynostemium , the stylus column, the agglomeration of stamens with the stylus and stigma is different .
literature
- 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. 134.