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Term	Definition
Non-resupinate	Turned 180° in development; e.g., flowers of most orchids in which the lip originates in the uppermost position but twists in such a way that the labellum faces downward at anthesis. Some orchids do not twist, thus the labellum faces up at anthesis.
Nucellus	The tissue that surrounds the megasporophyte or the embryo sac. It is located between the embryo sac and the integument or integuments.
Nucellus	The tissue that surrounds the megasporophyte or the embryo sac. It is located between the embryo sac and the integument or integuments.
Nuciform	Nut-shaped.
Nuclear endosperm	Endosperm development in which many nuclei develop before cell walls are formed.
Numerous	With 10 or more parts. See many.
Nut	A hard, indehiscent, unilocular, single-seeded fruit arising from a simple or compound ovary.
Nutant	Nodding,
Nutant	Nodding.
Nutlet	A small nut; often used to refer to one of the four parts of the mature fruit of some species of Boraginaceae, Lamiaceae, and Verbenaceae.
Nutritional mode	The way a plant gets its food, e.g., photosynthetic, parasitic, hemiparasitic, mycoheterotrophic, etc.
Ob-	A prefix meaning opposite or against, e.g., an obovate leaf blade is the opposite of an ovate leaf blade.
Obcompressed	Vertically (rather than laterally) compressed.
Obcordate	Shaped like an upside down heart.
Obdiplostemony (obdiplostemonous)	With two series of stamens with twice the number of stamens as petals and those of the outer series inserted opposite the petals and those of the inner series inserted opposite the sepals. Obdiplostemony is sometimes very difficult to determine in flowers at anthesis but become apparent with microtome and SEM studies of bud development (Endress, 2010).
Oblanceolada	Con forma lanceolada invertida. Se refiere a la forma de una lámina de una hoja u otra estructura similar, cuando es más ancha hacia la porción distal, sus márgenes son divergentes y cuya relación longitud/ancho es 3:1 o mayor
Oblanceolate	Referring to a leaf, bract, sepal, petal, or other structure in which the greatest width is distal to the midpoint and the length-to-width ratio is 3:1 to less than 6:1.
Oblate	Spheroidal but flattened at the ends; i.e., slightly broader than long. With the widest point at the middle and the length to width ratio 0.75/1 or less. This term can also refer to both three-dimensional a two-dimensional shapes.
Oblate	A sphere that is flattened at both poles or a sphere that is shorter in height than it is in width. The term can refer to both three- and two-dimensional shapes.
Oblique	Referring to a leaf base or similar structure in which the two sides are unequal.
Obliquely zygomorphic	An extension from the abaxial side of the androecium of Cariniana.
Oblong	Referring to a two dimensional shape in which the greatest width extends throughout a middle zone at least one-third the length of the blade (in this zone the margins are more-or-less parallel) and the length to width ratio is 2:1 to less than 3:1. Other types of oblong shapes are determined by the length to width ratio.
Oblonga	Se refiere a la forma de una lámina de una hoja u otra estructura similar, cuando posee márgenes paralelos cuya extensión es al menos un tercio de la longitud total de la lámina
Oblongoid	A solid form oblong in outline or visualized as a cylinder but more-or-less rounded at the base and the apex.
Obovada	Se refiere a la forma de una lámina de una hoja u otra estructura, cuando la parte apical es más ancha que la parte basal y cuya relación longitud/ancho es menor que 3:1
Obovate	Obovate refers to a leaf, sepal, petal, or other flat structure that is wider above the midpoint and has a length-to-width ratio of 1.5:1 to less than 2:1.
Obtriangular	A plane, inversely triangular shape with the attachment at the pointed end.
Obturamenta (singular = obturamentum)	See basal stoppers.
Obturators	In the Styracaceae, outgrowths of the placental wall that partly cover the ovules.
Obtuse	Blunt, usually referring to the apex or the base of a flattened structure (such as a leaf, bract, or petal) in which the two sides are straight and, when they meet, form an angle greater than 90°.
Obtuso	Usualmente se refiere a la base de un órgano de dos dimensiones (tal como una hoja), en el que el ángulo formado por las márgenes convergentes son superiores a 90°.
Ochraceous	Ocher-colored, yellow-brown.
Ochroleucous	Yellowish white.
Ócrea	Estructura formada de las estípulas fusionadas hacia la base, formando una vaina que rodea a una rama; por ejemplo, éste es un caracter diagnóstico en las Polygonaceae
Ocrea	A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae;
Ocrea	A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae; in palms, an extension of the leaf sheath beyond the petiole insertion, is a different kind of ligule.
Odd-pinnate leaf	Pinnate with an odd number of leaflets; i.e., without a terminal leaflet. Same as imparipinnate.
Olid	Emitting a smell.
Oligotrophic	Referring to habitats low in nutrients.
Ontogenetic	Referring to ontogeny.
Ontogeny	The course of growth and development of a living organism from inception to maturity. The famous saying, "ontogeny recapitulates phylogeny" means that the development of the species can be seen in the development of an individual of the species.
Opercular opening	The opening of a dehiscent-fruited species of Lecythidaceae.
Opercular rim	The circular scar that indicates where the operculum was attached to the fruit.
Operculate	Possessing an operculum. Same as lid.
Operculum	The lid of the fruit of species with circumscissilely dehiscent fruits as found in many species of Lecythidaceae; a valvelike opening into the stony endocarp of the fruit of some species (e.g., Humiriaceae); referring to a seed with an opening covered by a lid (e.g., Zingiberaceae) or the membranous cover of the nectary in Passiflora (Passifloraceae).
Operculum (plural = opercula)	Lid-like; the lid of a dehiscent fruit as found in many, but not all, Lecythidaceae.
Opposite	Arising from an axis, such as leaves from a stem, in pairs at the same node. Compare with alternate and whorled.
Opposite leaves	Reffering to leaves that arise from an axis in pairs at the same node. Compare with alternate and whorled.
Opuesta	Se refiere a la disposición de las hojas, cuando están en pares, insertas una a cada lado en un mismo nudo. Comparar con alterna y verticilada
Oral setae	Coarse, bristlelike appendages present at the summit of the leaf sheaths of some grasses.

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