Myriophyllum variifolium

Myriophyllum variifolium is a species of water milfoil native to eastern Australia where it grows in aquatic habitat such as ponds and streams. Joseph Dalton Hooker described the species in 1840, from material collected in the Lachlan River, as well as Tasmania. The Tasmanian material resembled the description more closely, and the New South Wales material has been separated as a different species, hence the original Tasmanian material was made the neolectotype. Myriophyllum variifolium is found from southeastern South Australia and western Victoria, and eastern Victoria through New South Wales into southeastern Queensland. It also occurs in central and eastern Tasmania. It grows in shallow still or slowly-moving water .30 to 2 m (0.98 to 6.56 ft) deep. An aquatic herbaceous plant, M. variifolium grows to about 50 cm (20 in) in length, its smooth stems around 0.5 cm (0.20 in) in diameter. Myriophyllum variifolium intergrades with the very similar M. simulans in western Victoria and Sou......read more on Wikipedia.