Either of two related trailing plants, Veronica americana of North America and V.beccabunga of Eurasia, growing in wet or moist places and having clusters of small blue or purplish flowers.

• 美洲婆婆纳两种有亲缘关系的蔓生植物的一种，北美洲的美洲婆婆纳和欧亚大陆的有柄水苦荬生长在潮湿的地方，有小的蓝色或紫色花簇