Adventive. Recently or imperfectly naturalized.
Alate. Winged.
Albumen. Any deposit of nutritive material accompanying the embryo.
Albuminous. Having albumen.
Alliaceous. Having the smell or taste of garlic.
Alternate. Not opposite to each other, as sepals and petals, or as leaves upon a stem.
Alveolate. Honeycombed, having angular depressions separated by thin partitions.
Ament. A catkin, or peculiar scaly unisexual spike.
Amphitropous (ovule or seed). Half-inverted and straight, with the hilum lateral.
Amplexicaul. Clasping the stem.