Family : Marsileaceae.

Water clover fern.

This aquatic fern is unfernlike with its four-leaf clover configuration. The rhizome spreads into the underwater soil, sending up fronds to the surface. The stipe length adapts to the water depth. The lamina is glabrous, satiny and fresh green. It enjoys the water's edge, small deep ponds, or wet spots with variable levels of water, in full sun or light shade. Deciduous. Hardiness : -20°C.