INVTIGATION OFTHE SEXUAL PROCESS IN INTERSECIFIC CROSSES BETWEEN CAMELLIA PITARDII PITARDII VAR. YUNNANENSIS AND C.CHRYSANTHA Rare and Endangered Plant,a New Variety of Camellia L. (Theaceae) from Sichuan Province,China Roles of Salicylic Acid in Inducing Resistance of Camellia to the Gray Spot and the Biochemical Responses Camellia pitardii var. longistaminata J. L. Liu & Q. Luo, a new variety of the Theaceae from China