Review of the Genus Oldenlandia L. (rubiaceae) and Related Genera in Australia

Abstract

Australian Rubiaceae previously referred to Oldenlandia and/or Hedyotis and Synaptantha are referred to Oldenlandia, Synaptantha, Kohautia and Hedyotis. Keys to recognized genera and species are given. Twenty species of Oldenlandia, two species of Synaptantha and four species of Hedyotis are recorded for Australia. Two new species, Oldenlandia kochiae and O. spathulata, one new subspecies, O. mitrasacmoides subsp. nigricans, and one new variety, Synaptantha tillaeacea var. hispidula are diagnosed and described. Oldenlandia leptocaulis, O. laceyi, O. largiflorens, O. thysanota, O. delicata, O. argillacea, O. mitrasacmoides subsp. trachymenoides and Synaptantha scleranthoides are new combinations based on Hedyotis leptocaulis Halford, H. laceyi Halford, H. largiflorens Halford, H. thysanota Halford, H. delicata Halford, H. argillacea Halford, H. trachymenoides F. Muell. and H. scleranthoides F. Muell. respectively. Lectotypes are designated for Hedyotis galioides, H. polyclada, H. coerulescens, H. mitrasacmoides, H. trachymenoides and Synaptantha tillaeacea.