1.segments 5, free, ovate to suborbicular, veinless, abaxially with a transverse wing near apex, adaxially concave, margin membranous.
裂片5，离生，卵形到近圆形，无脉，背面具横裂翅近先端，凹，边缘膜质。
2.Leaf blade small, entire or fimbriate-ciliate, veinless, 1-channeled on back, sometimes plane or convex.
叶片小，全缘的或流苏状具缘毛，无脉，在背面具1沟，有时平或凸。
3.septum complete, membranous, translucent, veinless;
隔膜完成，膜质，半透明，无脉；
4.septum complete or rarely perforated, membranous, translucent, veinless;
具孔的隔膜完全或很少，膜质，半透明，无脉；
5.septum complete, translucent or opaque, veinless or with a distinct midvein;
完全的隔膜，不透明的半透明或，无脉或具一离生中脉；
6.septum complete, thickened, opaque, veinless;
隔膜完全，加厚，不透明，无脉；
7.Stipules persistent, broadly triangular, ca. 1 mm, membranous, veinless;
托叶宿存，宽三角形，约1毫米，膜，无脉；
8.Stipules persistent, light green, oblong, 5-8 mm, membranous, veinless ;
托叶宿存，淡绿，长方形，5-8毫米，膜，无脉；
9.lower glume ca. 0. 5 mm, veinless, obtuse or emarginate;
更低的颖片约0.5毫米，无脉，钝的或微缺；