9[12]Davis G L.Systematic embryology of the angiosperms[M].New York:John Wiley and Sons,1966:83-84.
10[13]Wiens D,Nickrent D L,Davem C I,et al.Developmental failure and loss of reproductive capacity in the rare palaeoendemic shrub Dedeckeraeur ekensis[J].Nature,1989,338:65-67.
