The phenological cycle

the general characteristics of flower

the species of pollinators

the flower visiting behaviors and the pollination process were investigated in the population of

Merrillanthus hainanensis

. The pollen viability and stigma receptivity within the population were measured

and its artificial pollination test was also conducted. The results showed that: ① The phenophase of

Merrillanthus hainanensis

can be roughly divided into spreading stage

initial flowering

flowering stage

final flowering

fruiting stage

young fruit stage

fruit ripening and fruit falling. ② The hybrid index of

Merrillanthus hainanensis

is four

indicating that its breeding system is dominated by outbreeding

partly selfcompatible and needs pollinators. ③ Artificial bagging experiments showed that there was no spontaneous self-pollination phenomenon.  ④ The insect moved out of the pollen block by means of the special structure of the foot and inserted the pollen block into the stigma cavity through the opening of the anther to complete the pollination. The most frequent floral visitors were bees (

Megachile

sp.

Apis cerana and

Polistes formosanus

)．