Displaying 2026 - 2075 out of 3058 Object(s)

Term Definition
Ovary cross-section A section through the ovary made at a right angle to the long or vertical axis of a flower. A term used in the Lecythidaceae to determine the number of locules and to describe the placention of species and genera. Ovary cross-section
Ovary half-inferior An ovary of Lecythidaceae that bulges upward at the summit making the ovary appear half-inferior in contrast to an inferior ovary which is truncate at the apex.. Ovary half-inferior
Ovary inferior An ovary in which the other floral parts (calyx, corolla, and stamens) arise from the summit of the ovary. Ovary inferior
Ovary summit The area at or above the inside of the staminal ring. Ovary summit
Ovary summit obconical If the summit of the ovary slants upward directly on the inside of the staminal ring (i.e., the summit completely fills the inside of the staminal ring) the summit is obconical. Obconical ovary summits can be narrowly or broadly obconical. Ovary summit obconical
Ovary summit plateau-like The apex of the ovary sits on a raised plateau characterized by erect sides. Ovary summit plateau-like
Ovary summit truncate Appearing to be cut off at the apex, i.e., disregarding the style the summit of the ovary is flat. Ovary summit truncate
Ovary summit umbonate If the summit of the ovary arches upward directly on the inside of the staminal ring (i.e., the summit completely fills the inside of the staminal ring) the summit is umbonate. See style umbonate. Ovary summit umbonate
Ovate Ovate refers to a leaf, sepal, petal, or other flat structure that is wider at the base than at the midpoint, tapers toward the apex, and has a length-to-width ratio of 1.5:1 to less than 2:1. Ovate
Ovoid Egg-shaped; the three-dimensional version of ovate. Ovoid
Ovule The organ that after fertilization becomes the seed. The ovule in angiosperms contains the embryo sac with an egg cell, several other cell types, and is enclosed within the locule of the ovary. Ovule
Ovule The organ that contains the egg and, after fertilization, becomes the seed. The ovules are included within locules of an ovary and are attached to the placenta in different ways that, in some cases, are generic specific. Ovule
Ovule anatropous Referring to a curved downward ovule in such a way that the micropyle is close to the funicular attachment. Ovule anatropous
Ovule bitegmic An ovule with two integuments. Ovule bitegmic
Ovule campylotropous Referring to an ovule in which the axis is at an approximately right angle to its stalk (funicle). Ovule campylotropous
Ovule columns The number of vertical lines of ovules from the base to the apex of the placenta. The number of horizontal layers of ovules in a locule. A longitudinal section that removes the outside wall of a locule allows this feature to be seen with the most accuracy. It can also be observed in a medial longitudinal section. A longitudinal section that removes the outside wall of a locule allows this feature to be seen with the most accuracy. It can also be observed in cross sections through the placenta. Ovule columns
Ovule horientation oblique A type
Ovule insertion Referring to where ovules are inserted along the lower septum as viewed in longitudinal section. Ovule insertion
Ovule orientation The relationship between the direction that an ovule departs from the middle of the placenta in relation to the long axis of the ovary (equals the orientation of the lower/upper septum), as seen in a medial longitudinal section.
Ovule orientation horizontal Refers to an ovule that departs from the middle part of the placenta at a more-or-less 90 degree angle as seen in longitudinal section. Ovule orientation horizontal
Ovule orientation oblique An ovule that departs from the middle part of the placenta at an angle less than 90 degrees as seen in a longitudinal section. The angle is the upper angle of a line drawn through the ovules and intersecting with the vertical axis of the ovary as seen in longitudinal section. Ovule orientation oblique
Ovule orientation pendulous An ovule that departs from a poorly developed placenta that hangs downward at the apex of the locule as seen in a longitudinal section of the ovary. Ovule orientation pendulous
Ovule orthotropous Referring to a straight ovule in which the micropyle is positioned in a straight line and opposite the funicular attachment; referring to a growth habit in which the growing apex is oriented vertically. Ovule orthotropous
Ovule rows The number of horizontal layers of ovules in a locule. A longitudinal section that removes the outside wall of a locule allows this feature to be seen with the most accuracy. It can also be observed in a medial longitudinal section. A longitudinal section that removes the outside wall of a locule allows this feature to be seen with the most accuracy. Ovule rows
Ovule unitegmic An ovule with one integument. Ovule unitegmic
Ovules Structures that arise from placentae in the ovary locules. Among other cells, the egg and two polar nuclei are found in the ovule. After fertilization, the egg develops into an embryo and the polar nuclei develop into endosperm which, along with the seed coat, form the seed.. Ovules
Ovules anatropous Referring to a curved downwardly oriented ovule in such a way that the micropyle is close to the funicular attachment. Ovules anatropous
Ovules bitegmic An ovule with two integuments. Ovules bitegmic
Ovules horizontally oriented Ovules projecting outward at right angles from the vertical axis of the ovary. Ovules horizontally oriented
Ovules obliquely oriented downward — Ovules obliquely oriented downward
Ovules obliquely oriented upward Ovules projecting upward at less than right angles from the vertical axis of the ovary. Ovules obliquely oriented upward
Ovules pendulous Ovules that hang downward from the septum at apex of the locule with the micropyle facing upward. Ovules pendulous
Ovules tenuinucellate The presence of no cells or a single cell layer between the megasporophyte and the epidermal cells in the early development of the megasporophyte. Ovules tenuinucellate
Ovules tenuinucellate The presence of no cells or a single cell layer between the megasporophyte and the epidermal cells in the early development of the megasporophyte. The megasporophyte develops into the embryo sac which contains an egg that, if fertilized and the conditions are right, will develop into an embryo. Ovules tenuinucellate
Óvulo Estructura que después de la fertilización se transforma en la semilla. En las angiospermas, el óvulo tiene un saco embrionario que contiene a la célula-huevo y está encerrado dentro de el(los) lóculo(s) del ovario
Oxidation The process of using oxygen to break down glucose to obtain energy. This results in the production of carbon dioxide and water as by products. Carbon dioxide and water are also released when forests are burned resulting in the release of greenhouse gases in the atmosphere. Oxidation
Pachycaul A type of growth form in which the tree is unbranched (monocaulis) or sparsely branched, the stems are thick, and the leaves very large. Pachycaul
Pachycaul A type of growth form in which the tree is unbranched (monocaulis) or sparsely branched, the stems are thick, and the leaves very large. Pachycaul
Pachycaulous Referring to a growth form in which the branching is sparse and the higher-order branches and stems are not markedly diminished in thickness. Compare with leptocaulous. Pachycaulous
Pachytesta A seed coat formed mostly by the extended chalaza and not by the integument(s); note that the integument(s) can be reduced or developed in species with a pachytesta.
Palate In the Lentibulariaceae and Scrophulariaceae, the space at the throat and limb of the corolla used by pollinating insects as a landing platform.
Pale A bract found in the head of Asteraceae.
Palea The upper of the two bracts that enclose the floret in the Poaceae. Compare with lemma. Palea
Paleate (paleaceous) Possessing pales.
Paleoherbs A hypothesized clade of flowering plants including the Aristolochiales, monocots, Nymphaeales, and Piperales.
Paleotropics Referring to that part of the earth in the Old World between the Tropic of Cancer at 23 degrees 27 minutes N and the Tropic of Capricorn at 23 degress 27 minutes S. These are the northern and southern latitudes at which the sun can be directly overhead at some time during the year.
Palinactinodromous Referring to a type of leaf venation in which the primaries have one or more subsidiary points of radiation above the lowest point. Palinactinodromous
Palisade mesophyll Referring to one or more layers of cells located directly under the epidermal cells of the adaxial leaf blade surface. The palisade mesophyll is oriented vertically and is longer than broad. Photosynthesis takes place in both palisade and spongy mesophyll. Palisade mesophyll
Pallid Pale in color.
Palmate Referring to leaf venation in which the main veins of the blade radiate from a common point near the base or to compound leaves in which all leaflets radiate from a common point. See digitate. palmately lobed, palmatilobate, Palmate