Epiphytic or rock-dwelling. Roots rather thick and fleshy, smooth, mostly creeping over bark of host. Stems short or elongated; bases covered with persistent, dry leaf-bases. Leaves few, crowded, more or less flat or thick and channelled, narrowly oblong to linear, leathery. Inflorescence racemose, arched or pendulous, more or less lateral to main stem. Flowers 3–20, showy, fragrant; sepals and petals free, more than 5 mm long, more or less equal, lateral sepals joined, at least in part, to the column-foot. Labellum articulate at apex of column-foot, shallowly saccate, 3-lobed, spurred in front; lateral lobes large, more or less erect; mid-lobe attached to top of spur near its orifice, very small, usually fleshy, the thickening continued down wall of spur; spur relatively short, never cylindric, more or less fleshy, without appendages; callus at base of labellum large, more or less erect, fleshy and grooved. Column short, with perpendicular foot; upper margin of stigma (rostellum) small, not prominent.
Almost exclusively Australian, chiefly northern, genus with 19 species (18 endemic, 1 extending to New Caledonia), 2 species in Victoria.