Naked flower - flower without perianth.

Nematodes - microscopic soil dwelling worms that are
plant pests, feeding on leaves, roots and stems. Some
species of nematodes are beneficial by parasitizing insect
pests.

Node - a usually swollen part of the stem bearing a sidebranch or leaf.

Nodule - pea-like bodies growing on the roots of legumes. The nodules contain a nitrogen-fixing bacteria that convert nitrogen from the air into a plant usable form of nitrogen.

Nut - a hard shelled fruit with one seed that is indehiscent.

                       GLOSSARY  O

Obtuse - blunt and rounded.

Odd-pinnate - a pinnate leaf with a single leaf at the apex.

Oedema - small, corky raise spots found on the underside of leaves, esp. in geranium leaves. This is caused by cell breakdown due to excessive moisture

Offset - small bulblets that form at the base of mature mother bulbs.

Open-pollinated - When plants are pollinated naturally by wind or insects.

Ovary - the part of the pistil that produces future seeds.

Ovule -  the part of the ovary that develops into the seed.

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