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Term	Definition
Nocturnal	Appearing at night, e.g., the flowers of a bat-pollinated species.
Nocturnal	Appearing at night, e.g., the flowers of a bat-pollinated species.
Node	The part of the stem where buds, leaves, and or adventitious roots are produced.
Nodes swollen	Refferring to nodes that are larger in size than the stem; swollen nodes are especially characteristic of Piper (Piperaceae).
Non-cylindrical fruit	A fruit that is as long as broad or is shorter than broad.
Non-cylindrical fruit	A fruit that is as long as broad or is shorter than broad.
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.
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.
Ob-	A prefix meaning opposite or against, e.g., an obovate leaf blade is the opposite of an ovate leaf blade.
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).
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.
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.
Oblongoid	A solid form oblong in outline or visualized as a cylinder but more-or-less rounded at the base and the apex.
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.
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°.
Ocrea	A structure formed of stipules fused into a sheath and surrounding the stem; i.e., a diagnostic character of the Polygonaceae;

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