High Quality Content by WIKIPEDIA articles! Hydrocotyle umbellata, is an aquatic plant that thrives in wet, sandy habitat. Its English common name is manyflower marsh pennywort or dollarweed. It is native to North America and parts of South America. It can also be found growing as an introduced species and sometimes a noxious weed on other continents. It is an edible weed that can be used in salads or as a pot herb.