Abstract
1. In this article, the author intended to divide the Genus Cladium in a wide meaning into two natural groups, Cladium sensu stricto and Machaerina, by their morphological characters including the pollen grains.2. In the former group, leaves are coriaceous, dorsiventrally flattened and always 3-ranked, and achenes are somewhat drupe-like and not crowned by distinct beak at apex, whereas the latter has bilaterally compressed or terete leaves usually 2-ranked and has achenes crowned by a distinct beak often scabrous at tip.3. This division also very well agrees with the features of pollen grains, which are represented by 1-6-aperturate type in the former and polyforate type in the latter.4. Concerning the generic name of the latter, Vahl's Machaerina is legitimate.
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