Lathraea squamaria (Toothwort)


Summary Information


An annual or perennial herb, parasitic on the roots of a range of woody plants, especially Corylus, Fraxinus and Ulmus glabra. Its typical habitats include deciduous woodland, hedgerows, and river and stream banks. Generally lowland, but reaching 350 m at Alston (Cumberland).



World Distribution

European Temperate element; also in C. Asia.


Photos Information


Habitats Information

Broad Habitats

Broadleaved, mixed and yew woodland
Boundary and linear features (eg hedges, roadsides, walls)

Light (Ellenberg): 3 Information

Moisture (Ellenberg): 6 Information

Reaction (Ellenberg): 7 Information

Nitrogen (Ellenberg): 6 Information

Salt Tolerance (Ellenberg): 0 Information

January Mean Temperature (Celsius): 3.3 Information

July Mean Temperature (Celsius): 15 Information

Annual Precipitation (mm): 955 Information

Life Form

Life Form Information

Height (cm): 30

Perennation - primary


Perennation - secondary

Life Form - primary

Non-bulbous geophyte (rhizome, corm or tuber)

Life Form - secondary



Clonality - primary

Little or no vegetative spread

Clonality - secondary


Distribution Information

Count of 10km squares in Great Britain: 634

Count of 10km squares in Ireland: 120

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: -0.36

Weighted Changed Factor: 35

Weighted Change Factor Confidence (90%)


Conservation Status

Conservation Status Information

Plantatt Conservation Status

Other Accounts

Other Accounts Information


References Information

PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections.
A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references

Atlas (236b)
Hultén E, Fries M.  1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Meusel H, Jäger E, Rauschert S, Weinert E.  1978.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 2. 2 vols.