Thelymitra J.R.Forst. & G.Forst., Char. Gen. Pl. (1776) 97, t. 49
- Genus Macdonaldia Cunn. ex Lindl., Edwards's Bot. Reg. (1839) App.
- Genus Waireia D.L.Jones, M.A.Clem. & Molloy
Terrestrial plants. Subterranean tuber present. Stem very short,1-leaved. Leaf sheathing at the base, glabrous, dorso-ventrally flattened, not articulate, convolute, herbaceous. Inflorescence terminal, a raceme. Flowers medium-sized, resupinate, variously coloured. Sepals free. Petals free, usually somewhat broader than the sepals. Lip without spur, not mobile, similar to the petals, but often narrower. Column at the apex with two brush-like appendages, column-foot absent. Pollinia 2, sectile, caudicles present, stipe absent, viscidium present.
Species present in New Guinea: