Abstract
Five new species of Tupistra from the Malay Peninsula, T. elegans N. Tanaka, T. robusta N. Tanaka, T. malaiana N. Tanaka, T. kressii N. Tanaka, and T. urceolata N. Tanaka & W.J. Kress, are described, illustrated and compared with closely related congeners. Tupistra elegans and T. robusta are morphologically close to each other, sharing a sigmoid floriferous stem (including inflorescence), a campanulate perianth with anthers located around the orifice of the tube, and an umbraculate lobed stigma. Tupistra malaiana, T. kressii and T. urceolata appear to have close affinity, sharing an urceolate perianth with anthers inserted subdistally on the tube. In Tupistra, the urceolate perianth is very likely an apomorphy.
