Thank you for reporting limnocharis or mikania vine to Biosecurity Queensland.
Limnocharis is an introduced aquatic plant that invades waterways, lakes, dams, ponds, and wetlands and competes with native species. Limnocharis grows up to 1.1 metres tall and has yellow flowers and large round leaves on long triangular stems.
Mikania vine is an introduced extremely fast-growing smothering vine that poses a serious threat to agricultural industries, damages the natural environment and affects the habitat of native animals. Mikania has smooth heart-shaped leaves, 4–13 cm in length, that taper to an acute point. The leaves grow in opposite pairs along their stems which are slender, ribbed and bear fine, white hairs. The leaves also have a pungent smell when handled.