Lemna trisulca
Lemna trisulca L. is a species of aquatic plants in the arum family Araceae. It has a subcosmopolitan distribution. Unlike other duckweeds, it has submerged rather than floating fronds, except when flowering or fruiting. Also unlike other duckweeds, a large number of fronds remain attached to each other at a time.
Description
The fronds usually grow submerged and are oblong-lanceolate in shape and are up to 14 mm long. They are blunt at the end and taper to a tail-like stalk at the other.The flowering fronds are smaller than the vegetative fronds and somewhat curl up from under the water to the surface to present the flowers ; .