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There are currently 22 names in this directory beginning with the letter O.
A prefix, meaning the inversion of, or in a reverse direction

Narrow pointed leaf shaped wider at the top, sharply narrowing at the base.

With unequal sides, especially a leaf base; petiole attachment where the midrib extends at an angle of approximately 45 degrees from the petiole, Ex. B. rex

Oblique Acute
A leaf base that is a combination of oblique and acute, meaning sharply tapering to a point but two sides unequal

Oblique Base
A leaf base that has unequally sided lobes, can be used in conjunction with other base descriptions

Oblique Leaf Position
The midrib extends from the petiole at an angle of about 45 degrees

Having an elongated form with slightly parallel sides, roughly rectangular

A leaf shape where the broadest part is above the middle, oval shape with narrower end near the base, reverse egg shape

A solid having the form of an inverted egg

An inverse or reversed triangle

A leaf shape that is a wide diamond shape, angular obovated

Blunt or rounded, having converging edges at the apex at an angle greater than 90 degrees

Obtuse Apex
A leaf apex (tip) that has an angle between 90 degrees and 180 degrees and has sides that are reasonably straight with the angle. If the apex is pointed it is a sharply obtuse apex, and if the apex is rounded off, it is a rounded obtuse apex

In begonias, a small lid that is found on the seed ends

With two leaves or other part originating at one point, but located on opposite sides of the axis

A leaf shape that is approximately or nearly round in outline, peltate

The expanded basal portion of the pistil that contains the ovules View Illustration

Ovary, Partly Superior
With part of the ovary extending above the tepals

Ovary, Wholly Inferior
With the ovary totally below the tepals

Oval, or egg-shaped, with a tapering point and the widest portion near the petiole

In the shape or outline of an egg

The plant structure that develops into a seed when fertilized

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