Abstract
The chromosome numbers of 34 species representing 11 of Schlechter's sections were determined, of which 32 were 2n=38 and 2 were 2n=40. The chromosome numbers of 7 of these species had not been reported previously. Detailed examinations of chromosome morphology were made of species representing 11 sections. The mean chromosome size, S%, and F% were as variable among species within a section as between the sections. Although karyotype analysis of species did not prove to be useful in delineating sections in the genus Dendrobium, it was utilized in an attempt to clarify the taxonomic relationships between D. biggibum and D. phalaenopsis.
