Abstract: Taking three Epimedium wushanense populations as test objects, this paper studied their flowering phenology and reproductive feature, and analyzed the differences in the floral syndrome, flowering phenology index, and fruit set among the populations as well as the effects of flowering phenology index on the reproductive success of E. wushanense. The flowering span of E. wushanense was from early March to mid and late April, and the flowering phase of the population, individual, and single flower lasted approximately 22-27, 12-17, and 3-4 days, respectively. The flowering amplitude curves of the populations at individual level were of single peak and higher synchrony, exhibiting a “massflowering” pattern. Correlation analysis showed that fruit set number had significant positive correlations with peak flowering date, last flowering date, flowering duration, and bud number, but less correlation with first flowering date. The analysis of the coefficient of variation of flowering phenology indicated that there existed significant differences in the flowering duration, last flowering date, peak flowering date, fruit set number, total flower number, flowering amplitude, and frit set, but less difference in the flowering synchrony index and first flowering date among the three populations. In addition, the fruit set was also affected by the spur of E. wushanense. This study showed that the flowering phenology and reproductive feature of E. wushanense were affected by micro-environment, and the reproductive
feature was also affected by the spur of E. wushanense.

Key words: water coupling with nitrogen, dry matter accumulation, drip irrigation, N fertilizer use efficiency, maize.