Tall panicum miliaceum. The culms are erect, usually unbranched, with a height of 1-4 meters, and each node at the base has aerial roots. Leaf sheaths have transverse veins; Ligule membranous, about 2 mm long; Leaf blade is flat and broad, linear and lanceolate, base is round and ear-shaped, hairless or flawed, midvein is thick, and the edge is slightly rough.
The terminal male spike is large, and the main axis, raceme axis and leaf axils are puberulent; The male spike is a twin, with a length of 1 cm, a long spike stalk and a short spike stalk, which are 1-2 mm and 2-4 mm respectively, and are puberulent; The two glumes are nearly equal in length, membranous, about 10 veins, ciliate; Palea and palea are transparent, slightly shorter than Yu Ying; Anthers orange-yellow; It's about 5 mm long.
Female inflorescence is surrounded by most broad sheath-like bracts; Female spikelets are twins, arranged in 16-30 longitudinal rows on the coarse axis, with two glumes of equal length, wide, veinless and ciliate; The lemma and palea are transparent, and the pistil has an extremely slender linear style.
The caryopsis is spherical or oblate, which is exposed outside the glume and barnacle when it is mature, and its size varies with different growth conditions. Generally, it is 5- 10 mm long, slightly longer than its width, and the embryo length is 1/2-2/3 of that of caryopsis. Chromosome 2n=20, 40, 80. Autumn in flower and fruit period.