Cytological studies on13species of Compositae from Hainan,China Karyomorphology of the Three Species of Saussurea (Asteraceae) from Hengduan Mountians and the Adjacent Areas Phylogenetic Relationship of Ramie and Its Wild Relatives Based on Cytogenetics and DNA Sequences Chromosome numbers of twelve species of bryophytes from China Variation of the chromosome number and cytomixis of Houttuynia cordata from China