vaginate

petiole 1--10(--18) cm, glabrous or puberulous, vaginate at base;

叶柄1-10(-18)厘米，无毛或被微柔毛，具鞘的在基部；

Leaves on vegetative branchlets reduced, totally adnate to branches, gray-green, amplexicaul, vaginate, apex acute.

营养小枝上的叶退化，全部贴生于枝，绿色，抱茎，具鞘，先端锐尖。