erect, large herbs, rootstock a tuberous rhizome. Leaves cauline, large,
spirally arranged, pinnately veined, midrib prominent, blade rolled in bud,
petiole sheathing stem. Inflorescence raceme, or panicle. Flowers large and
showy, bisexual, obliquely oriented, conspicuously bracteate. Perianth
biseriate, outer series of 3 herbaceous
sepals, persistant, inner series of 3 connate petals, one smaller than other 2.
Staminodes and stamens in two whorls : outer whorl with (2 or) 3 petaloid
staminodes, usually red or yellow, inner
whorl with a reflexed staminode termed
labellium, and a fertile stamen, filament petaloid, anther solitary. Ovary
3-locular. Fruit capsule, warty. Seeds small, numerous.