Hornwort Ceratophyllum demersum

Features

It is a submerged, free-floating aquatic plant, with a cosmopolitan distribution.

Species	Perrenial
Living space	Lake, Pond, Swamp, Wet site
Size	0,2-300 cm

Description

The leaves are produced in whorls of six to twelve, each leaf 8–40 mm long, simple, or forked into two to eight thread-like segments edged with spiny teeth; they are stiff and brittle. It is monoecious, with separate male and female flowers produced on the same plant. The flowers are small, 2 mm long, with eight or more greenish-brown petals; they are produced in the leaf axils. The fruit is a small nut 4–5 mm long, usually with three spines, two basal and one apical, 1–12 mm long.