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A contribution to the reproductive biology of Diphylleia sinensis (Berberidaceae) in Zhongdian,Yunnan province

MA Shao bin 1,2 ,HUANG Heng yu 1,ZHAO Nian xi 1,CAI Xiao hu 1 (1 Biology Department of Yunnan University,Kunming 650091,China;2 Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany,CAS,Kunming 650204,China)  
The reproductive biology including population structure,sexual reproduction as well as vegetative propagation of Diphylleia sinensis (Berberidaceae) has been observed and analyzed.The result shows that in natural condition,\%Diphylleia sinensis\% mainly distributes in gentle slopes of seepage or along streams.The plant shows a kind of aggregated distribution pattern.The plant processes both sexual and asexual reproduction,population regeneration is good.From seed germination to sex mature needs about 5 to 6 years,sex matured individual has 1 terminal cymose inflorescence which contains 3 to 28 (mean=16.24±4.04) bisexual flowers,each flower contains 1 to 17 (mean=6.34±2.35) ovule,an individual contains 40 to 202 (mean=95.04±36.68) ovules. D.sinensis is allogamy and its pollinators are tenthredo and beetles.In autumn,each cyme contains 3 to 26 (mean=15.63±3.94) fruits and of each contains 0 to 11 (mean=3.01±2.13) seeds,thus an individual contains about 47.05 seeds.Fruit set ratio is from 58.3% to 100% (mean=85.8%±10.5),seed set ratio is about 60.41%.Inbreeding is compatible.In the favorable environments,the plant can carry vegetative propagation by rhizome.
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