Stem erect, green or somewhat tinged purple, 30-100 cm tall, terete or obtusely angulate, much branched, glabrous or slightly pubescent.

• 茎直立，绿色或有点微染紫色，30-100厘米高，圆柱状的或钝具棱的，多分枝，无毛的或稍具短柔毛。