New combinations and two new central Queensland taxa in the Dendrobium tetragonum (Orchidaceae: Epidendroideae) complex

摘要

Two new taxa of Dendrobium tetragonum, D. tetragonum subspecies cataractarum, and subspecies tetragonum var. serpentis, are described from remote areas of central Queensland. A new classification of the D. tetragonum complex is presented on the basis of distribution, morphology and published molecular analyses, establishing northern, central and southern subspecies, with a total of six varieties. A neotype is assigned for D. tetragonum var. giganteum Leaney, the earliest described taxon of the complex in northern Australia.