Callitriche obtusangula

Tracheophyta MagnoliopsidaCallitrichaceaeCallitricheCallitriche obtusangula


A perennial herb typical of permanent, still or slow-flowing mesotrophic to eutrophic waters, extending into brackish water in coastal grazing marshes. It also grows in a terrestrial form on wet mud as water levels drop. Lowland.



World Distribution

Suboceanic Southern-temperate element.

© S. Hammonds

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 11

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 6

Salt Tolerance (Ellenberg): 1

January Mean Temperature (Celsius): 4.1

July Mean Temperature (Celsius): 15.7

Annual Precipitation (mm): 840

Length: 60

Perennation - primary


Life Form - primary

Perennial hydrophyte (perennial water plant)



Clonality - primary

Irregularly fragmenting (mainly water plants)

Count of 10km squares in Great Britain: 757

Count of 10km squares in Ireland: 157

Count of 10km squares in the Channel Isles: 4

Atlas Change Index: 1.35

Weighted Changed Factor: -42

Weighted Change Factor Confidence (90%)


JNCC Designations


Atlas text references

Atlas (151a)
Meusel H, Jäger E, Rauschert S, Weinert E
1978.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.
Preston CD, Croft JM
1997.  Aquatic plants in Britain and Ireland.
Schotsman HD
1967.  Les Callitriches: espèces de France et taxa nouveaux d'Europe.