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。

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。