Objective The flowering phenology and reproductive modules distribution of Manglietia glanca Blume was studied to provide a basis for the research of its abortion mechanism in introduction area.

Method The M. glanca stands in Arboretum, Baiyun Experimental Farm and Fubo Experimental Farm of the Experimental Center of Tropical Forestry in Pingxiang were chosen as observation object. Taking Dafni's method as reference, the flowering phenology, flowering characteristics and reproductive modules distribution of M. glanca were investigated at both stand and individual plant level, the flowering dynamic was observed, and the size, quantity and location of floral components were calculated.

Result The results showed that the flower was bisexual flower. The androecium bore in the bottom of the gynoecium, its height reached only the lower edge of the gynoecium. The flowering process could be divided into six stages, i.e. mixed bud, flower bud, white alabastrum appearing, white alabastrum, blooming and falling. Twice opening/closure flowering was observed during the blossoming process. In suitable region, the flowering characteristics of M. glanca were relatively stable, with moderate intensity blossoming. The effect of altitude on flowering phenology was obvious. The distribution of reproductive modules was also significantly different between forest edge and interior, the fruit setting rate was low.

Conclusion According to the result of observation, the flowering phase of M. glanca is tranquil, flowering synchronization index is higher, but conversion rate of blossom into bear fruit is extremely low in Pingxiang, Guangxi.