Leaves tufted toward stem base or inserted on procumbent stem. Verticillasters congested. Calyx 6-7 mm, campanulate, membranous, yellowish when dry.

• 对于茎基部或着生于丛生的叶平卧的茎。轮状聚伞花序密集。花萼6-7毫米，钟状，膜质，干燥时淡黄。