Roots present on the undersurface
Roots variable in number on each cladode, often 2–5, only occasionally fewer or more Cladodes elliptic to obovate, 3–10 mm long, with 7–16 veins; length/breadth ration 1–1.5 Spirodela Cladodes ± round or broad-ovate, 2–5 mm long, with 3–7 veins; length/breadth ration 1.5–2 Landoltia