An overview of the Thelymitra nuda (Orchidaceae) complex in Australia including the description of six new species Jeffrey A. Jeanes Royal Botanic Gardens Melbourne, Birdwood Avenue, South Yarra, Victoria 3141, Australia; e-mail:
[email protected] Introduction Abstract Thelymitra J.R.Forst. & G.Forst. is a complex genus of orchids consisting The Thelymitra nuda J.R.Forst. & G.Forst. of about 110 described species, several described natural hybrids and at complex is defined as a group and an overview of the Australian members is least 10 undescribed taxa. It is concentrated in higher rainfall areas of presented. Six new species, T. alcockiae temperate Australia, but a few species occur in tropical north-eastern D.L. Jones ex Jeanes, T. alpina Jeanes, Australia, about 20 species occur in New Zealand (14 endemic) and a T. glaucophylla R.J. Bates ex Jeanes, few species occur in Indonesia, New Caledonia, New Guinea and the T. paludosa Jeanes, T. petrophila Philippines. Jeanes and T. queenslandica Jeanes, are described and illustrated. The key diagnostic characters are discussed Taxonomic history and discussion where relevant. Information on The complex of taxa surrounding Thelymitra longifolia J.R.Forst. & G.Forst. distribution, habitat, flowering time, pollination biology and conservation (the type species of Thelymitra) is vast, and probably includes about half status is given for all taxa. A the total number of species in the genus (Bates 1999). The first botanist dichotomous key is provided. to study the genus in any detail was Robert Brown (1810), who described three new species, which can be placed in the T.