Pedunculate water-starwort was found in Ireland and England, but is now an invasive species due to its resistance to environmental stressors, and its ability to grow in still water.

[1] The habitats ranges from ephemeral pools, lakes and canals to fast-flowing upland rivers Europe-wide.

[2] This species can be found in ditches, ponds, wetlands, and in shallow waters of lake margins and drains.

The Callitriche bruita is most abundant in the upland regions of Britain and Ireland, as well as areas in the New Forest (South Hampshire) and the Lizard Peninsula (West Cornwall).

Arsenic can exist in the environment in a range of chemical forms with varying levels of toxicity, mobility, and bioavailability.

Sexually, the plants reproduce via pollination of the male stamen and fertilization of the female pistil, in which it will produce a zygote.