abaxial | acaulescent | accessory flower parts | achene | acicular | acropetal | actinomorphic | aculeus | acumen | acuminate | acute | adaxial | adnate | adventitious | adventive | aerenchyma | aggregate | allele | allelochemicals | allelopathy | alternate | alternation of generations | alveola | alveolate | anaerobiosis | anastomosis | anatomy | androecium | androgynal | androgynous | androphore | anemophily | Angiospermae | annual | anoxia | anther | anthesis | antrorse | apetalous | apical | apiculate | apocarpous | apomixis | appressed | aquatic plants | aquatic vascular plants | arachnoid | arcuate | aril | aristate | articulate | ascending | asepalous | attenuate | auricle | aut- or auto- | autogamous | autogamy | auxins | awn | axil | axillary