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| Word | Description |
| Acid soil |
A soil which has a pH of less than 7. These soils are usually high in organic matter. The opposite of alkaline. |
| Alkaline soil |
A soil which has a pH of higher than 7. Often soils which are high in chalk or limestone. The opposite of acid. |
| Annual |
Of one year´s duration, as in plants that germinate, flower and die all in one season (year). |
| Anther |
The male part of a flower bearing the pollen. Anthers are carried at the ends of filaments but can be sessile |
| Anther tube |
Tube formed by the anthers. |
| Aureolin |
Shade of yellow. |
| Axil |
The point of junction of stem and leaf. |
| Axillary |
Growing from an axil. |
| Axis |
The main line of growth in a plant or organ, as the stem, from which the other parts such as the leaves and flowers grow. |