The karyotype analysis was carried out on Eucommia ulmoides introduced from Lanzhou using root tips of germinating seeds as material.The results indicated: There were 34 small chromosomes in Eucommia ul-moides,which are in good agreement with previous results;there were two kinds of chromosomes karyotype,one karyotype formulas was 2n=34=20m(2SAT)+10sm+4st,and the other was 2n=34=20m(2SAT)+12sm+2st,Satellite chromosome have been found in two kinds of karyotype,which were located in short arm of metacentric c...