1. Stems erect, ca. 30 cm tall, glabrous, simple,
slenderly striate.
茎直立,约30厘米高,无毛,单,纤细具条纹。
2. Stems 40-50(-65) cm tall, branched at base, glabrous,
slenderly striate, leafless above.
茎40-50(-65)厘米高,在基部分枝,无毛,具条纹的纤细,上部无叶。
3. Stem 35--40 cm tall, simple or
slenderly 2-branched at base, sparsely spreading pubescent.
茎35-40厘米高,简单或者细长2在基部分枝,稀少开展的短柔毛。