Change in Fruit Qualities during the Late Stage of Fruit Development in Chaenomeles speciosa and Its Identification of Fruit Ripening Process Study on HPLC Finger Print of Chinese Quince Classification of Flowering Quince Resource Identification of Anthocyanins Involving in Petal Coloration in Chaenomeles speciosa Cultivars Purification process of flavonoids from Chaenomeles speciosa(sweet) with macroreticular resin Identification of Anthocyanins Involving in Petal Coloration in Chaenomeles speciosa Cultivars