Although an estimate of the deceptive pollination systems with nectarless flowers has been usually cited as one‐third of the nearly 30 000 species in Orchidaceae, the quantitative measurements of nectar production in orchid flowers remain scarce. The genus Dendrobium is species‐rich, economic and horticultural importance, a group of epiphytic orchids in tropics characteristic of nectar spur. Previous studies in southeastern Asia showed these Dendrobium species generally involving deceptive pollination, with an assumption these species are nec...
