Lagarosiphon major (Ridl.) Moss ex Wager

• a submerged aquatic plant with stems up to 5 m long that are usually rooted to the substrate.
• its small strap-like leaves (5-20 mm long and 2-3 mm wide) are densely arranged in a spiralling pattern along the stems.
• these leaves are strongly bent downwards and have minute teeth along their margins.
• its tiny flowers are pink or purplish in colour and borne just above the water surface on long thread-like stalks.

[From: Environmental Weeds of Australia]