Whorled pennywort is a flowering hydrocotyle native to North and South America as well as the West Indies. It is characterized by its half-dollar like leaves which can grow into compact bushes of green. This plant is versatile and can be used in the foreground, midground or background. It is undemanding and grows fast, often out-competing and overgrowing the tank if left untrimmed. By frequently trimming new growth and using high light with CO2, the plant can stay low growing and create a carpeting effect over the foreground.