Chromosome counts are made for 17 species of the family Orchidaceae in Japan. Preparations were made from root tips by the modified squash method (Mutsuura & Nakahira, 1956). Chromosome numbers of 14 species are reported for the first time, and those of 3 species are reconfirmed (Table 1,Figs. 1-2,Plate 1). We have found the 2n nu-nbers 18,20,24,46,48,56,60 and 64 in the Orchidaceae in Japan. Chromosome numbers of Habenaria Miersiana, Dendrobium moniliforme and Cymbidium virescens are different from those reported previously (Table 1)
