The Morphological Characteristics and Its Types of Yunjie (Eruca sativa Mill.) in China Intergeneric Crosses between Eruca sativa Mill. and Brassica Species Histological Stud ies of Somatic Embryogenesis in Eruca sativa Mill. Structure and development of floral nectary in Eruca sativa (Gars.) STUDIES ON KARYOTYPES OF THREE SPECIES IN CRUCIFERAE Somatic Embryogenesis and Establishment of Plant Regeneration System of Eruca sativa Mill. Preliminary Studies on the Variation in Self-compatibility among 52 Cultivars of Eruca sativa