Lemna trisulca

Common name: 

Ivy-leaf Duckweed

Family: 

Araceae
(alternate family: Lemnaceae)

Distribution (from Flora of Victoria):

Wannon, Grampians, Victorian Volcanic Plain, Otway Plain, Gippsland Plain, Wilsons Promontory (DEJKPT) all States except NT

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Distribution and ecological preference at Wilsons Promontory (if known):

Floating in fresh water1

Flower description:

Flowers are rare as this species usually reproduces vegetatively. Petals are absent when in flower2

Habit:

Floating below water surface, except when flowering or fruiting2

Distinguishing characteristics (within family/genus):

Distinguished from L. disperma by the absence of roots and the thallus floating underneath the surfaces instead of suspended on the water surface2

Images:
Image of Lemna trisulca
Conservation status:

Poorly known in Victoria and is suspected to be either rare, vulnerable, endangered or extinct

References:

1 Ellis, M. (unpublished). “A Field Guide to South Gippsland Flora”.
2 Walsh, N. G. and Entwisle, T. J. “Flora of Victoria”, volumes 2 (1994), 3 (1996) and 4 (1999). Inkata Press, Port Melbourne, Victoria