WildBristol.uk - Discovering Wildlife in Bristol

Stace 4:

Spirodela polyrhiza (L.) Schleid. (Lemna polyrhiza L.) - Greater Duckweed.

Fronds 1.5-10 x 1.5-8mm, more or less flattened on both surfaces; 2n=40. Native; canals, ditches and ponds; rather local in Central & South Britain and Ireland, very scattered in North Britain, formerly Channel Islands.