Rhizome: The perennial rhizome is very developed. The culm is upright, 1-3 (8) meters high, 1-4 cm in diameter, with more than 20 nodes, the base and upper internodes are short, and the longest internode is located in the lower section 4-6, with a length of 20-25 (40 ) Cm, the knot is wax powder. Leaf: The lower part of the leaf sheath of the reed is shorter than the upper part and longer than its internodes; a circle of short cilia with a length of about 1 mm is densely formed on the edge of the leaf tongue,and the marginal hairs on both sides are 3-5 mm long and easy to fall off; the leaves are lanceolate. , 30 cm long, 2 cm wide,hairless, and the tip is long and tapered into a silk shape.
Flowers: Reeds are large panicles, 20-40 cm long, 10 cm wide, with many branches, 5-20 cm long, with densely drooping spikelets; spikelets 2-4 mm long, glabrous; small The panicle is about 12 mm long and contains 4 flowers; the glume has 3 veins, the first glume is 4 mm long; the second glume is about 7 mm long; the first infertile lemma male is about 12 mm long, the second lemma is 11 mm long , With 3 veins, apex is long and acuminate, base plate is elongated, both sides are densely growing with filamentous pilose that is longer than lemma, and there are obvious joints at the joint with glabrous small cobs, which are easy to fall off from the joints after maturity; inside; The palea is about 3 mm long, with two rough ridges; the stamens are 3, and the anthers are 1.5-2 mm long, yellow; the caryopsis are about 1.5 mm long.
Flowering period of reeds from August to December