A grass-like herb. It has long fattened tubers or corms. The plant can re-grow from these. It grows 20-50 cm high. There is a creeping rhizome. The leaves are 20-50 cm long by 1-2 cm wide. They are erect. They are dark green with prominent veins. The flowers are in short spikes. These have few flowers but many papery bracts. The flowers are 1.5 cm across. They are yellow and hairy. They have a long slender perianth tube. The fruit is a capsule about 0.5 cm long. It is enclosed in a bract.