Abstract
＂Remusatia vivipara＂ and ＂Remusatia pumila＂ can produce both sexual flowers and asexual bulbils. However, ＂R. vivipara＂ seldom set seeds, whereas ＂R. pumila＂ have regular seed set. Our aim was to understand the asexual mode of bulbil development and the reasons for sexual failure in ＂R. vivipara＂. Asexual bulbil development was observed by scanning electron and light microscopy. Pollen viability and germination rate were counted for at least 200 pollen grains in triplicate for each inflorescence. Chromosome counting was performed to confirm ＂R. vivipara＂ as triploid species. The bulbiliferous shoots of both ＂R. vivipara＂ and ＂R. pumila＂ initiate from the upper portions of tubers. As they elongate upward, bulbil clusters generates in each node of the shoot. Bulbils develop several hooked scales on top simultaneously, which facilitate dispersal because they can easily attach to the animal's fur. Although ＂R. vivipara＂ produces showy flowers in spring, their pollen grains were inviable and unable to germinate in vitro in sucrose solution, when compared with ＂R. pumila＂. These two bulbiliferous species have diversified their reproductive strategies, with respect to ＂R. vivipara＂ being able to reproduce completely asexually and ＂R. pumila＂ being able to reproduce both sexually and asexually.
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