Luisia Gaudich., in Freyc., Voy. Uranie, Bot. (1826) 426, t. 37
- Genus Birchea Rich., Ann. Sci. Nat. Bot.
- Genus Mesoclastes Lindl., Gen. Sp. Orchid. Pl. (1830) 44
- Genus Trichorhiza Lindl. ex Steud., Nom.
Monopodial epiphytes. Stem elongated, with several leaves arranged in two rows. Leaves sheathing at the base, glabrous, terete, deciduous, leathery. Inflorescence lateral, very short, a raceme or carrying a single flower. Flowers small to medium-sized, resupinate, usually greenish with a maroon lip. Sepals free. Petals free, often much longer than the sepals. Lip adnate to the column, without spur, flat, more or less clearly divided into a basal part and an apical part of different thickness and texture. Column-foot absent. Pollinia 2, solid, with a short slit, caudicles absent, stipe present, viscidium present.
Species present in New Guinea: