Discovery and Evaluation of Natural Mixoploid(2x + 4x)Variants in Ziziphus jujuba Mill.‘Dongzao’ A comparative study on karyotypes of 28 taxa in Rubus sect. Idaeobatus and sect. Malachobatus (Rosaceae) from China STUDIES ON THE MORPHOLOGICAL AND CYTOLOGICAL CHARACTERISTICS OF PONKAN (CITRUS RETICULATA BLANCO)MIXOPLOID Discovery and Evaluation of Natural Mixoploid(2x + 4x)Variants in Ziziphus jujuba Mill.‘Dongzao’ Chromosome Numbers and Karyotypes of 10 Wild Bramble ( Rubus L . ) Spec ies from Southwest of China Chromosome Numbers and Karyotypes of 10 Wild Bramble ( Rubus L . ) Spec ies from Southwest of China Report on Karyotypes of Smilacina tatsienensis and Ophiopogon japonicus Discovery of Heptaploid Allium macrostemon in Daluo Mountain,Zhejiang and the Preliminary Analysis on Its Formation Mechanism CYTOLOGICAL IDENTIFICATIONS ON CYTOLOGICAL OBSERVATION ON HYBRID-EMBRYO-DERIVED CALLI AND REGENERATED PLANTS OF HORDEUM VULGARE×TRITICUM AESTIVUM Morphology and Cytology of Intergeneric Hybrid between Hordeum vulgare L. and Roegneria ciliaris (Trin) Nevski in F1, F2, and BC1 Breeding of a new variety (Tianjing No.1) of Chinese herbal medicine-type forage grass mixoploid Lycium barbarum