Muticous (muticus). Without awns or spines.
Naked (nudus). Not enveloped by a perianth or by carpels.
Nerve (nervus). A vascular bundle in a leaf or leaf-like organ, usually appearing as a dark or translucent line or a ridge projecting on the under surface.
Net-veined (reticulatim venosus). With the lateral nerves irregularly connected by a network of small veins.
Neuter (neuter). Without perfect sexual organs.
Node (nodus). The usually knot-like part of the stem, where a leaf or a whorl of leaves are inserted.
Nut (nux). A dry and indehiscent fruit, especially one with a thick and hard rind.
Ob- (ob-). Reversedly. Thus obcordate or obovate = cordate or ovate, the upper part the broader.
Oblong (oblongus). About 3-6 times as long as broad and rounded at the top.
Obtuse (obtusus). Blunt, i.e., narrowed, but not pointed at the apex.