ob-
Prefix meaning inverted, in reverse direction.
obcordate
Heart shaped with the notch at the apex.
oblanceolate
Tapering and widest towards the apex or inversely lanceolate.
oblong
Rectangular.
obovate
Roughly elliptical or reverse egg shaped and widdest near the apex (i.e., the terminal half broader than the basal half).
obtuse
Blunt or rounded at the apex, with the sides meeting at an angle greater than 90°.
operculate
With a small lid.
opposite
A pair of organs attached at nodes in pairs on either side of a stem or axis.
orbicular
Almost or approximately circular.
outbreeding depression
A reduction in vigor of offspring from distant parents. It can occur when a locally adapted population is moved and mixed with plants adapted to different conditions.
outer canopy deciduous
Marked reduction in leaf number in the outer canopy in exposed high light environments over winter.
ovary
Part of a flower containing the ovules and later the seeds.
ovate
Egg-shaped and widest at base.
ovoid
Oval; egg–shaped, with rounded base and apex.
oblique
Slanting; of a leaf, larger on one side of the midrib than the other, in other words asymmetrical.
oval
Planar, shaped like a flattened circle, symmetrical about both the long and the short axis; about twice as long as broad, tapering equally both to the tip and the base. Synonymous with elliptical.
