Spirodela oligorrhiza

Description

Spirodela�is a genus of�aquatic plant, one of several genera containing plants commonly called�duckweed.�Spirodela�species are members of the�Araceae�under the�APG II system. They were formerly members of the�Lemnaceae. Spirodela species are free-floating thalli; two to five plants may remain connected to each other. Plants are green, but may have a red or brown underside. Multiple roots (seven to 12) emerge from each thallus. Spirodela is larger (10 mm (0.39 in)) than Lemna (2 mm (0.079 in) � 5 mm (0.20 in), one root per thallus).