Rhizomatous herbs of mediocre to gigantic size; leaves distichous, with open ligulate sheaths; inflorescence paniculate, the branches scorpioid, rarely racemose, terminating the leafy stem, or scapose and arising directly from the rhizome; calyx tubular or turbinate, regularly 3-lobed or bursting irregularly at anthesis, usually more or less coriaceous or petalaceous; corolla tubular, 3-lobed; stamen not petalaceous; labellum more or less conspicuously 3-lobed; lateral staminodia absent or very inconspicuous; ovary inferior, 3-celled; ovules numerous; fruit a fleshy, irregularly dehiscent capsule.