Oblique, applied to leaves, &c., means unequal-sided.
Oblong, from two to four times as long as broad, [52].
Obovate, inversely ovate, the broad end upward, [53]. Obovoid, solid obovate.
Obtuse, blunt or round at the end, [54].
Obverse, same as inverse.
Obvolute (in the bud), when the margins of one piece or leaf alternately overlap those of the opposite one.
Ocellate, with a circular colored patch, like an eye.
Ochroleucous, yellowish-white; dull cream-color.
Ocreate, furnished with Ocreæ (boots), or stipules in the form of sheaths, [67].
Octo-, Latin for eight, enters into the composition of Octagynous, with eight pistils or styles; Octamerous, its parts in eights; Octandrous, with eight stamens, &c.