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Flower size variation at the inflorescence and individual levels and its trade-off with flower number in Polygonum hydropiper(Polygonaceae) Genetic Analysis on Flowering and Boll Setting in Upland Cotton(Gossy　pium hirsutum L.) 　Ⅱ. The Genetic Behavior of Different Fruiting Sites Trade-off between the biomass and number of flowers in Stellera chamaejasme along an elevation gradient in a degraded alpine grassland Studies on reproductive allocation, floral size and its trade-off with floral number of annual Gentiana