Stem erect or slightly curved in upper part, laxly branched, base 5-7 mm in diam., nodes swollen in lower part, with few supporting roots and many fibrous roots.

• 茎直立或稍弯曲在上半部分，稀松的分枝，基部直径的5-7毫米，在下半部分节膨胀，具很少支持根和很多须根里的。