gynostemium


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gynostemium

[¦gīn·ō′stē·mē·əm]
(botany)
The column composed of the united gynoecia and androecium.
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References in periodicals archive ?
This clade is defined by the fusion of the carpellary apices into three gynostemium lobes (character 56).
The latter four species share the possession of 8-10 stamens (40), 8-10 gynostemium lobes (56) and a complete syrinx (29).
The present analysis shows that this species is a member of subgenus Siphisia and confirms the observations by Wyatt (1955) and Pfeifer (1966) that the gynostemium of A.
Our observations indicate, however, that the gynostemium in both species is primarily trilobed (Gonzalez & Stevenson, 2000b).
Duchartre (1864) described subsection Acerostylis as having a truncate gynostemium which is a misinterpretion as observations of Franchet (1882) as well as our own (based on the specimen Thesiger s.
These characters are not simply correlated with each other, because the number of carpels in other members of the family does not always correspond to the number of stamens; for example, there are twelve stamens and six carpels in Asarum and Saruma, four carpels and 6-36 stamens in Thottea, or six stamens and three gynostemium lobes in Aristolochia subgen.
In all species of Aristolochia and Thottea, a constriction is formed above the ovary that functions as an abscission zone by means of which the perianth and the gynostemium fall off (see Gonzalez & Stevenson, 2000a).
We have coded 8-10 stamens (and 8-10 gynostemium lobes in character 56) because this range corresponds to the infraspecific variation in most of the species of Aristolochia subgen.
This character is not simply related to the presence of three gynostemium lobes in subgenus Siphisia because in Thottea stamens are grouped even though there is no gynostemium (see Gonzalez & Stevenson, 2000b).
0) free, (1) fused forming a gynostemium (see Gonzalez & Stevenson, 2000b).