20 40 60
Displaying 1 - 11 out of 11 Object(s)
Term Definition
Apical placentation A type of placentation in which the ovules are attached at the apex of the locule. See placentation. Placentation of Grias neuberthii. Photo by X. Cornejo.
Axile placentation A type of ovule arrangement in which the ovules arise from placental tissue derived from the apices of the septa of a locule. In this type of placentation the apices of the septa are fused or in very close proximity to one another. Axile placentation. Photo by S. A. Mori.
Basal placentation A type of placentation in which the ovules arise from the base of the locule. Axile, parietal, free-central, and basal placentation. Drawing by B. Angell.
Laminar placentation A type of parietal placentation in which the ovules arise along the surface (rather than the margins) of the carpels. Compare with marginal placentation; see placentation. Axile, parietal, free-central, and basal placentation. Drawing by B. Angell.
Marginal placentation A type of parietal placentation in which the ovules arise along the margins of the carpel. Compare with laminar placentation; see placentation. Marginal placentation of Jeffersonia diphylla. Photo by S. A. Mori.
Parietal placentation A type of placentation found in compound, unilocular ovaries in which the ovules arise from placentae inserted on the wall of the locule near the sutures. Fruit of papaya. Photos by S. A. Mori.
Placentation In broadest terms, the arrangement of ovules within the ovary. See axile, basal, free-central, and parietal placentation. Axile, parietal, free-central, and basal placentation. Drawing by B. Angell.
Placentation In broadest terms, the arrangement of ovules within the ovary. The most basic type of placentation classifies species as having parietal, axile, or free-central placentation. Placentation of Couroupita guianensis. Photo by C. M. Potascheff
Placentation basal A type of placentation in which the ovule is attached to the floor of the locule. Axile, parietal, free-central, and basal placentation. Drawing by B. Angell.
Placentation bilamellar A type of placentation that runs the length of the locule with two rows of ovules attached to two lamellae. Placentation of Couroupita subsessilis. Photo by S. A. Mori.
Placentation free-central A type of placentation in which the ovules are borne on a central column arising from the base of a unilocular ovary. Axile, parietal, free-central, and basal placentation. Drawing by B. Angell.