Karyotypes of three Carya Nutt. species ( Carya illinoensis from America, Carya cathayensis from Zhejiang and Carya tonkinensis from Yunnan) were studied.

• 对山核桃属中的美国山核桃 Carya illinoensis、浙江山核桃 Carya cathayensis、云南山核桃 Carya tonkinensis的核型进行了研究 .