flower_gynoecium_placentation

Explore the data for this trait in the portal

• Label: Placentation
• Entity URI: https://w3id.org/APD/traits/trait_0012442
• Type: categorical
• Definition: A floral organ morphology trait [TO:0000862] which is the position [PATO:0000140] of the ovules [PO:0020003] within the ovary [PO:0009072], known as placentation [APD:glossary/40074].;The different types of placentation in apocarpous/unicarpellate and in syncarpous gynoecia.
• Additional comments: In apocarpous and unicarpellate gynoecia, placentation is often described as marginal as the ovules are usually attached along the ventral slit (i.e., the zone where the carpel margins become postgenitally closed during carpel development). In syncarpous gynoecia there are three main types of placentation, 1) axile placentation refers to ovaries where the ovules are placed in the angle between carpel flanks in the center of the ovary; 2) in ovaries with parietal placentation the ovules attach to the ovary wall where two carpels meet; 3) in ovaries with free-central placentation the ovules are attached to a central column that emerges from the base of the ovary and protrudes into the non-septate ovary. It is not unusual that syncarpous gynoecia show a transition from proximally axile to a distally parietal placentation (e.g., Polemoniaceae). Basal and apical placentation may occur both in apocarpous/unicarpellate and in syncarpous gynoecia. Usually there is one longitudinal series of ovules attached to each carpel margin. However, both in apocarpous/unicarpellate and in syncarpous gynoecia there may be more than one series of ovules at the flanks of a carpel. These latter cases are referred to as laminar (or laminar-diffuse) placentation (e.g., in some Nymphaeaceae). A placenta that is protruding from its surroundings and has more than two series of ovules (either axile or parietal) is called protruding-diffuse. Definition and trait values derived from Schoenenberger et al. (2020) for their character '412. Placentation (D1)'
• Allowed values:

  value	description
  apical	Ovules attach at the top of the ovary; pendulous; in syncarpous gynoecia and apocarpous and unicarpellate gynoecia.
  axile	Ovules are placed in the angle between carpel flanks in the center of the ovary; in syncarpous gynoecia.
  basal	Ovules attach at the base of the ovary; in syncarpous gynoecia and apocarpous and unicarpellate gynoecia.
  free_central	Ovules are attached to a central column that emerges from the base of the ovary and protrudes into the non-septate ovary; in syncarpous gynoecia.
  laminar	When there is more than one series of ovules at the flanks of a carpel; in syncarpous gynoecia and apocarpous and unicarpellate gynoecia.
  marginal	Ovules attach along the ventral slit; in apocarpous and unicarpellate gynoecia.
  parietal	Ovules attach to the ovary wall where two carpels meet; in syncarpous gynoecia.

See the AusTraits Plant Dictionary (https://w3id.org/APD/traits/trait_0012442) for additional information about this trait.

Coverage

For this trait, AusTraits includes a total of 858 records. This includes:

• data for 757 species.
• data for 194 families.
• data from 2 datasets (see the portal Citations tab for a list of sources)