Hydnocarpus hainensis is a restrictedly distributed species in Southeast Asia which is ranged from southern China to Vietnam. The Chinese population is mostly restricted in Hainan Island. It is listed as vulnerable according to the IUCN Redlist though its status might be outdated. However, as it is mainly found in low altitude in mountaneous regions where deforestation is serious, it still constitutes certain level of conservation importance.Based on the on-site observation, flowers emit some unpleasant smell like spoiling food. Flowers in anthesis are very easy to detach where mass dropping of flowers occur in strong wind.
