| Accessary bud |
Achene |
| Adaptation |
Adventitious |
| Aerial root |
Aestivation |
| Aggregate fruit |
Alternation of Generation |
| Amphibia |
Androecium |
| Angiosperm |
Annual rings |
| Annulas |
Anobolism |
| Antennal |
Asexual reproduction |
| Assimilation |
Axil |
| Barb |
Berry |
| Biennial |
Bipinnate |
| Bisexual |
Blade |
| Bract |
Bracteole |
| Breathing root |
Budding |
| Bulb |
Bulbil |