Raceme of few to many pedicellate fls; floral bracts short, scarious. Per. tubular with 5 fleshy lobes, ± split between the lateral sepals which stand uppermost; tube gibbous beneath labellum; petal lobes small and just within mouth of tube. Labellum included, adnate to gibbous part of tube, its free portion ± oblong with submedian longitudinal calli and undulate margins. Column us. long, very narrowly winged; anther terminal, erect then bending forward, pollen in angular granules; stigma broad, basal, hollow; rostellum represented by flap under anther. Plants terrestrial, non-green; rhizome elongated, sympodially branched, mycorrhizal, bulky and filled with starch, nodes bearing remnants of scale lvs. Lvs represented on erect stem only by short loose sheathing scales. About 15 spp., from Himalayas to Japan and southwards through Malaya to Australasia. One N.Z. sp. shared with Australia, the other 2 endemic and both with short columns.
Leafless terrestrial orchids with rootless, fleshy, elongated rhizomes that sometimes look like a yam or potato. Inflorescence racemose, multiflowered, tip of raceme sometimes nodding. Flower stem fleshy, brown, solid. Peduncle much longer than rachis. Sterile bracts encircling stem, scarious. Pedicels fleshy, obliquely erect. Flowers tubular, completely enclosing labellum and column, suberect to pendulous. Sepals fused along margins, fleshy, often with roughened or verrucose exterior. Petals short, overlapping sepals, tips free. Labellum attached weakly by basal stalk to vestigial column foot. Labellum lamina 3-lobed, with flexible basal claw; lateral lobes broad, with entire to crinkled/crispate margins. Callus consisting of a series of keels or ridges, papillate, often producing granules of yellow, starchy pseudopollen. Capsules erect, often verrucose.