The Monandreae have been subdivided into twenty-eight tribes, the characters of which are based on the structure of the anther and pollinia, the nature of the inflorescence, whether terminal or lateral, the vernation of the leaf and the presence or absence of a joint between blade and sheath, and the nature of the stem.   anvd [Please select]

Other kinds of vernation are _revolute_, the opposite of involute, where the leaf is rolled backwards towards the midrib; _circinate_, rolled from the apex downwards, as we see in ferns; and _corrugate_, when the leaf is crumpled in the bud.   anvd [Please select]