"water milfoil." YourDictionary, n.d. Web. 11 December 2018. <https://www.yourdictionary.com/water-milfoil>.
water milfoil. (n.d.). Retrieved December 11th, 2018, from https://www.yourdictionary.com/water-milfoil
Any of various cosmopolitan aquatic herbs of the genus Myriophyllum, having whorls of feathery submersed leaves, especially M. spicatum of Eurasia, which can form dense mats in North American rivers and lakes.