Spikelets sessile, 2-flowered, terete or somewhat laterally compressed, muticous subtended by a pseudo-involucre of broad coriaceous bracts; florets both hermaphrodite; rhachilla disarticulating beneath the superior glume, produced as a fine bristle beyond the superior floret.
Inflorescence narrow, slender, large, composed of clusters of spikelets on opposite sides of its branches; each cluster borne in the axil of a deciduous sheath which is usually without a lamina.
Lemmas exceeding the glumes, many-nerved (11-23), with transverse veinlets, imbricate, dorsally rounded, chartaceous to chartaceous-coriaceous.
Inferior glume absent; superior glume 11-18-nerved, dorsally rounded, chartaceous to coriaceous, with the margins involute.
Paleas slightly shorter than the corresponding lemmas, 5-11-nerved, 2-keeled, flat between the keels.
Caryopsis crustaceous, with a free pericarp, with a pilose apical appendage.
Stamens 6; filaments free, anthers distinctly mucronate.
Leaf-laminae finally disarticulating from the sheath.
Ovary pilose at the apex; stigma 1.
Tall woody bamboos.
Lodicules absent.