The genus Dendrobium Swartz of the Orchidaceae comprises between 800 and 1600 species distributed from Japan to Tasmania and India to Poly nesia, and has been subdivided into 41 sections on the basis of floral and vegetative characteristics (Schlechter 1912). Although the first chromosome counts of Dendrobium species were recorded by Hoffman in 1929, very little was known about the cytology of this genus until the middle of this century. Chromosome numbers of 133 species have been recorded to date, 110 of which are 2n=38, 20 are 2n=40, 2 are 2n=76, and one, D. kingianum, is variable from 2n=38 to 2n=114 (
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