Plants in this section have thick, fleshy to terete leaves produced along a thin and wiry stem. by authors including
David Jones,
Mark Clements and
Stephan Rauschert for some species formerly included in the genus
Dendrobium. A 2008 paper, based on a study the
molecular phylogenetics of a wide range of related orchids, concluded that "the splitting of Australasian dendrobiums into various genera by other authors is excessive and unnecessary" moving the species back to the section Rhizobium. ==Distribution==