It is a submerged plant with slender, branching stems about 20–70cm (8–28in) long. The light green, narrow leaves are up to 6cm (2in) long and 1-2mm wide, slightly broadening at the tip. The leaves which can float on top of the water, are shorter and wider, they are also light brownish or pinkish green.[3] It has tiny inconspicuous green flowers and fruits,[4] and has a flowering period of between May and October.[5] or between April and September in the UK.[4]
Taxonomy
Figure from Deutschlands Flora in Abbildungen, illustrated by Johann Georg Sturm
Callitriche hamulata is native to a wide area, which stretches from Greenland,[2][8] and Iceland,[3] through Europe to North-western Africa.[2]
It is widespread and fairly frequent in Britain, particularly in south eastern England.[4]
Habitat
It is found in rapidly flowing streams,[9] which are well oxygenated, and freshwaters, from sea level to about 1,200m (3,900ft) above sea level.[5] This plant can grow in shallow waters and can also adapt to a deeper water level, especially after flooding.[3] It can also be found in or near ponds, ditches, in still or slow moving water.[4]
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