Once a year. Roots are whisker-like, and tall plants have supporting roots.
Culms erect or base geniculate. Leaf sheaths loose, hairless or sparsely pilose or warty;
The tongue is extremely short; The leaves of the Yangtze River Delta are flat, narrowly lanceolate or linearly lanceolate. Panicle compactly cylindrical or slightly farther at base;
Spikelets 2-5 clustered on the main axis or more spikelets inserted on short branches, oval, with blunt ends;
The second glume is as long as the spikelet and oval;
The first lemma and spikelet are the longest, the apex is blunt, and its lemma is short and narrow;
The second lemma is oval, blunt at the top, with punctate wrinkles, and the edge is rolled inward and narrow;
The pulp is wedge-shaped and slightly concave at the top; Style base separation;
The veins between the upper and lower epidermis of leaves are long cells with microwave lines or no ripples and thin walls. Lilacs are gray. The flowering and fruiting period is May-65438+1October.