Resolution of the Thelymitra aristata (Orchidaceae) complex of south-eastern Australia

Abstract

The seven currently known taxa in the Thelymitra aristata Lindl. complex are reviewed and descriptions are presented for each. Thelymitra adorata Jeanes and Thelymitra kangaloonica Jeanes from eastern New South Wales are described as new and illustrated. The key diagnostic features relating to the size and colour of the perianth, the shape of the post-anther lobe of the column, the presence or absence of auxiliary lobes, the density of the hairs on the lateral lobes and the placement of the anther are elucidated. Information on distribution, habitat, pollination biology, flowering time and conservation status is given for all seven taxa.The main distinguishing features of Thelymitra aristata, Thelymitra epipactoides F.Muell., Thelymitra grandiflora Fitzg., Thelymitra planicola Jeanes, Thelymitra silena D.L Jones and the two new species are tabulated. A key is provided to distinguish all seven members of the T. aristata complex.