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An ovary with free central placentation, on the other hand, consists of a single compartment without septae and the ovules are attached to a central column that arises directly from the floral apex (axis). In some cases a single ovule is attached to the bottom or top of the locule (basal or apical placentation, respectively).
Parietal placentation: occurs in the gynoecium formed by two or more carpels welded by their edges forming a single cavity in the ovary, so that each placenta corresponds to the edges of two contiguous carpel leaves. Some of the families that present this type of placentation are: Orchids, Violaceae, Passifloraceae and Cucurbitaceae.
a androecium g gynoecium p petals s sepals r receptacle. The insertion point is where a, p, and s converge. The terminology of the positions of ovaries is determined by the insertion point, where the other floral parts (perianth and androecium) come together and attach to the surface of the ovary. [18]
The ovary of the gynoecium produces one or more ovules and ultimately becomes the fruit wall. Ovules are attached to the placenta in the ovary through a stalk-like structure known as a funiculus (plural, funiculi). Different patterns of ovule attachment, or placentation, can be found among plant species, these include: [1]
The labels with darker backgrounds are less common. "V" used by Prenner et al. for the number of ovules per gynoecium is followed by lowercase letter describing the type of placentation. For epicalyx/calyculus, the letter "k" is used. The numbers are inserted after the labels, they may be formatted as sub- or superscript.
Floral diagram of Anagallis arvensis. [1]: 307 The dot represents the main axis, green structure below is the subtending bract.Calyx (green arcs) consists of five free sepals; corolla (red arcs) consists of five fused petals.
The gynoecium consists of three or four carpels, united to form a unilocular ovary. The placentation is apical, with two ovules at the apex of each carpel. The ovary has a central column in Medusandra and Soyauxia. Each carpel bears a stylulus and these are well separated at the apex of the ovary.
The ovule production are given by gynoecium of one carpel, which are reduced in number related to the perianth. The pistil has only one ovule, the Gynoecium is also monomerous with only one carpel in inferior side. The placentation seems to be in an apex.