Histological Investigation on Floral Reversion of Impatiens balsamina L. Endogenous Hormone Contents of Cut Freesia Flowers during Vase Holding Morphological Relation among Direction of Petals’ Order, Seminal Leaves and Leaf Rank in Cotton and Some Plants Else of Malvaceae and Other Families Construction of SSH cDNA Library and the Corresponding EST Analysis in Petals and Labellum of Cymbidium lianpan Histological Investigation on Floral Reversion of Impatiens balsamina L.