7Kang H, Primark R B. Temporal variation of flower and fruit size in relation to seed yield in celandine poppy (Chelidonium m ajus) [J]. Amer. J. Bot. , 1991, 78: 711-722,104.
8Rocha O, Stephenson A G. Effect of ovule position on seed p roduction, seed weight and progeny performance in Phaseolus cocdneus[J]. Amer. J. Bot. , 1990, 77: 1320-1329.