Althaea officinalis

Tracheophyta MagnoliopsidaMalvaceaeAlthaeaAlthaea officinalis

Ecology

A perennial herb of coastal habitats, growing on the banks of ditches containing brackish water, in brackish pastures, and in the transition zone between the upper saltmarsh and freshwater habitats. It is intolerant of grazing and cutting. It also occurs as a garden escape. Lowland.

Status

Native

World Distribution

Eurosiberian Temperate element; widely naturalised outside its native range.

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 7

Reaction (Ellenberg): 8

Nitrogen (Ellenberg): 4

2

Salt Tolerance (Ellenberg): 2

January Mean Temperature (Celsius): 4.4

July Mean Temperature (Celsius): 16.4

Annual Precipitation (mm): 774

Life form information

Height (cm): 120

Perennation - primary

Perennial

Life Form - primary

Hemicryptophyte

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 125

Count of 10km squares in Ireland: 0

Count of 10km squares in the Channel Isles: 2

Atlas Change Index: -0.29

Distribution information

JNCC Designations

NBNSYS0000003139

Scarce Atlas Account

Scarce Atlas Account: 

Althaea officinalis L.

Marsh-mallow

Status: scarce 

A. officinalis is locally frequent in the coastal zone, growing on the banks of ditches with brackish water or where the upper parts of saltmarsh give way to freshwater habitats. It is particularly common by ditches in grazing marshes which have been converted to arable land, as it is notably intolerant of grazing and cutting. It can form a dominant sward in brackish pastures from which stock have been removed. It is a shade-tolerant species, found under Quercus robur by the Solent estuary where ancient woodland borders saltmarsh. The distribution of A. officinalis is strictly lowland, and at coastal sites it grows mainly on alluvial soils. It is also recorded as an escape from cultivation away from the coast.

A. officinalis is a perennial, flowering in the late summer and reproducing by seeds.

This species has declined through most of its British range, partly due to drainage and partly due to the development of the coastal zone for industry and housing. The decline was first noted in the last century (Hanbury & Marshall 1899) and still continues except where sites survive on waterlogged soils, near the sea, but protected from stock.

A. officinalis reaches its northern limit in Europe in Britain, Denmark and central Russia, also occurring in north Africa and west Asia, and as a rare introduction in North America.

The past use of A. officinalis for the production of sweetmeat and its ornamental appearance are responsible for its introduction well outside its native range.

 

J. O. Mountford

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 (89b)
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.
Stewart A, Pearman DA, Preston CD
1994.  Scarce plants in Britain.