Key to Tasmanian Dicots
Aponogeton (Aponogetonaceae) 4b:13
The only species of the family Apogetonaceae in Tasmania is a naturalised species of Aponogeton. Aponogeton distachyos (Water Hawthorn) is a rooted aquatic, with leaves with long petioles and large, parallel-veined oblong or elliptical blades that float on the surface of the water. The flowers are in an inflorescence that also floats on the water on a long stalk. The inflorescence has two branches, each bearing several flowers - the flowers are sessile and comprise a single, white petal a few cm long and a cluster of stamens and carpels.

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