water pennywort

water-pennywort的词性：
n.（名词）

1. Any of various creeping perennial herbs of the genus Hydrocotyle in the parsley family, having orbicular leaves and small, white or greenish flowers grouped in umbels. Also called navelwort
美洲石胡荽：几种伞形科天胡荽 属的多年生草本植物之任一种，生有球形叶和小的白色或绿色花朵及聚成伞状的年花 也作 navelwort