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Floral biology and breeding system of Hypericum perforatum A Study on Breeding System of the Endangered Plant Cistanche deserticola Study on the Floral Biology and Breeding System of Heteroplexis Plants Mating system and causes of low fructification rate by self-pollinationof Codonopsis pilosula BROKEN INCOMPATIBLE BARRIERS TO THE PRE-FERTILIZATION OF INTERSECTIONAL CROSSING IN POPLAR