Abstract
During vegetative growth aerial shoots of Flagellaria indica bifurcate regularly at intervals even though axillary meristems are absent. Dichotomy involves no change in the cytohistological organization of the apical meristem; the shoot apex simply enlarges in the plane of distichy, a median furrow appears, and two new equal centers of meristematic activity are constituted in a process of continuous growth. Dichotomy can occur at any stage in the plastochron, and the morphology of the leaf immediately below the fork may be modified under the influence of the two new meristematic centers. The first leaf on each of the new apices is always on the same side, so there is no mirror image symmetry. The suggestion that dichotomy is the result of precocious axillary branching is discussed but rejected.
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