Perennial, rhizomatous herbs, with stems long or short,
or absent. Leaves solitary or tufted, lanceolate or ovate, erect. Inflorescence
terminal or radical, bracts 2-ranked,
each subtending a single flower, bracteoles present. Calyx tubular,
spathaceous. Corolla tube long, slender, lobes oblong or lanceolate. Labellum
often saccate. Lateral staminodes usually shorter than petals, filaments almost subequal to anther
length, dehiscing by slits, or more rarely by pores, crest rounded, or lobed or
absent, epigynous glands linear, free. Ovary 3-loculed, or unilocular. Fruits ellipsoid.