Abstract:

The chromosome number and karyotype of Arundina graminifolia (D.Don) Hochr and Eria gagnepainii Hawkes et. Heller.were studied by applying fingertip pressing method. The results showed that the number of the somatic chromosome of Arundina graminifolia was 2n=40, along with two satellite， its karyotype formula was 2n=2x=40=16m+22sm+2st, The composition of relative length of chromosome is 2L+18M2+18M1+2S. The number of the somatic chromosome of Eria gagnepainii was 2n=36, its karyotype formula was 2n=2x=36=28m+8sm. The composition of relative length of chromosome is 4L+18M2+12M1+2S .The two diploid mainly consists of metacentric and submetacentric chromosomes. The karyotype of A. graminifolia is 1A,and E. gagnepainii is 2B ,which are all symmetric.