Monopetalous

having the corolla in one piece which is formed by the union of several petals. Mucronate, abruptly pointed by a sharp spinous process. Multifid, having deep and numerous subdivisions or laciniations. Muricated, rough, with short hard tubercular excrescences. Nectariferous, possessing a nectary; also secreting nectar, that is, a sweetish exudation, secreted by glands in different parts of plants. Nectary, any supplementary organ in the flower, whether glandular or not, which cannot readily be referred to the parts forming the floral whorls; also certain parts of the whorls themselves, of anomalous character, whether secreting nectar or not. Nerves, the fibrous bundles extending through the leaves, often ramified, like veins or nerves in the animal structure. Nerveless, without nerves. Netted, resembling network. Nodding, having the summit so much curved that the apex is directed perpendicularly downwards. Node, one of the parts of the stem from whence a leaf springs, espe-cially when a little thickened or swollen. Nodose, knotted. Nut, a hard indehiscent pericarp. Ob, in composition signifies that the point of attachment is at the opposite extremity to where it occurs in the form defined by the simple word; thus ob-clavate is the inverse of clavate, the attachment being at the thicker end; ob-cordate, is the inverse of cordate, the attachment being at the narrow end; ob-ovate, is the inverse of ovate, the attachment being at the narrow end.

Oblique

when the parts of an organ are so divided that the sides are more or less unequal.

Oblong

of a bluntly elliptical shape, where the major and minor axes bear a proportion to each other of about four to one.

Obtuse

blunt.

Ochrea

a tubular membranous stipule, through which the stem seems to pass.

Ochreate

furnished with ochrea.

Opposite

applied to similar parts or organs when so arranged in pairs, that one of them is immediately on the opposite side of some interposed body, or of the axis about which they are disposed; thus - oppositi florus is where the peduncles are opposite; oppositifolius, where the leaves are opposite.

Orbicular

perfectly or very nearly circular.

Ovary

the lowermost portion of the pistil, containing the ovules, and ultimately becoming the fruit.

Ovate

of the form of an egg, if applied to a solid body; or of the figure presented by a longitudinal section of an egg, if applied to a superficial area.

Ovoid

a solid with an ovate figure.

Ovule

the rudimentary state of a seed.

Palate

the inferior surface of the throat in ringent and personate corollas.

Pales

the membranaceous bracts forming the perianth of grasses; also the chaff-like scaly bracts on the receptacle of some Composites.

Palmate

having the arrangement of parts on any organ such as to imitate the form of an open hand.