1.有槽的,有沟的,有纵沟的
1.marked with lengthways parallel grooves
1.Stems and branches terete, sulcate or angular, glabrous or young shoot and inflorescence pubescent.
茎和分枝圆柱状，具槽的或具角，或幼枝和花序短柔毛。
2.Branchlets sulcate, sparsely covered with early glabrescent long hairs.
小枝具槽，稀少地为早期的后脱落长毛所覆盖。
3.Branchlets terete, longitudinally angular and sulcate, glandular-pubescent when young.
小枝圆柱状，具纵棱和具槽，幼时的腺状短柔毛。
4.vitta numerous (ca. 20), scattered throughout the mesocarp. Seed face deeply sulcate.
油管多数（大约20），在整个中果皮散布。
5.Stems erect, rarely ascending to prostrate, branched, not hollow or sulcate.
茎直立，对匍匐很少上升，分枝，并非空的或具槽。
6.Branchlets of current year conspicuously sulcate, dark reddish brown, glabrous.
显著具槽的当年小枝，棕色，无毛的深色带红色。
7.Stem stout, hollow, finely sulcate, glabrous or pubescent.
茎粗壮，空，具细槽，无毛或被短柔毛。
8.fertile lemma irregularly granular, flanks sulcate, apex obtuse or shortly 3-toothed, awnless.
不规则颗粒状的能育外稃，具3齿，awnless的短侧面具槽，先端钝的或。
9.Stems longitudinally ridged and sulcate.
茎有纵向的棱和槽。
10.Stem erect, hollow, finely sulcate, glabrous.
茎直立，空，具细槽，无毛。