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Index O
| Oblanceolate: | Lanceolate with the wider part towards the apex. | |
| Oblong: | Leaves rounded at the tip, longer that broad. | |
| Obovate: | Inversely ovate, with broader end uppermost. | |
| Obtuse: | Blunt. | |
| Offset: | Short runner with clusters of leaves at the tip. | |
| Offshoot: | Side growth or shoot - as in bulbs. | |
| Opposite: | The arrangement of leaves or buds on a stem where two leaves or buds are attached at each node. | |
| Orbicular: | Disk-shaped. | |
| Orchid: | Member of the Orchidaceae family, which contains 835 genera of perennials, more than half epiphytic, the rest terrestrial. They are characterised by their unique flower structure. | |
| Organ: | Part of a plant with a particular structure and function. | |
| Organic: - Gardening: | Carbon based matter of plant or animal origin. Gardening practice using only natural materials. | |
| Organic material: | Any material which originated as a living organism. (i.e. peat moss, compost, manure) | |
| Organelle: | A membrane-bound structure within the cytoplasm of a cell that is organised to perform a specific cellular function. | |
| Osmunda Fibre: | Chopped , dried roots of the fern genus used in orchid cultivation. | |
| Ovary: | Female organ of a flower. | |
| Ovate: | Leaves oval in shape and broadest at their base. | |
| Ovule: | Part of the ovary from which seed develops after fertilisation. | |
| Oxygenator: | Fully submerged aquatic plant that releases oxygen into the water. |
Last updated
10 March, 2002
© copyright 1999, P. A. Owen