Resolution of the Thelymitra fuscolutea R. Br. (Orchidaceae) complex of southern Australia

Abstract

The seven currently known taxa in the Thelymitra juscolutea R.Br. complex from southern Australia are discussed and descriptions are presented for each. Thelymitra jacksonii Hopper & A.P.Br. ex Jeanes, Thelymitra magnifica Jeanes and Thelymitra yorkensis Jeanes from southwestern Western Australia are described as new and illustrated. The key diagnostic features relating to the size and colour of the perianth and the shape of the supra-anther lobe of the column 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 benthamiana Rchb.f., Thelymitra dedmaniarum R.S.Rogers, T. fuscolutea and Thelymitra stellata Lindl. and the three new species are tabulated. A key is provided to distinguish all seven members of the T. fuscolutea complex.