Military orchid (Orchis militaris)

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Military orchids in flower
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Military orchid fact file

Military orchid description

KingdomPlantae
PhylumTracheophyta
ClassLiliopsida
OrderOrchidales
FamilyOrchidaceae
GenusOrchis (1)

The rare military orchid earns its name from the appearance of the pink to purplish flowers (2), which look like small soldiers. They have an ash coloured 'helmet' formed from three sepals, the petals are hidden by the helmet but the white lip which projects downwards from the helmet has distinct 'arms' and 'legs', spotted with red 'tunic buttons' (4). The leaves are green in colour and glossy, and typically there is a single flower spike (2).

Size
Height: 30-60 cm (2)
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Military orchid biology

This perennial orchid flowers in May and June (2), the main pollinators are thought to be hoverflies and bumblebees (6). After a seed germinates, it is thought that it can take about four years before leaves appear and a further four years before the plant produces flowers (2). A single plant can live for up to 15 years (6).

The Greek name Orchis means testicle, all members of this genus have two globular root tubers which led to orchid root being used as aphrodisiacs since classical times (5). The military orchid was called 'souldiers cullions' (which means 'soldiers' testicles) by John Gerard in The Herball of 1597 (5).

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Military orchid range

In Britain this orchid is very rare, and is known only from Suffolk and the Buckinghamshire Chilterns (5). Elsewhere it is known throughout Europe reaching as far north as southern Sweden (2). Before the nineteenth century it was fairly widespread in the chalklands of southern England (5). By the mid-1920s, however, it was thought to have become extinct in Britain, but was rediscovered in 1947 (2).

You can view distribution information for this species at the National Biodiversity Network Gateway.
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Military orchid habitat

Inhabits calcareous, open grasslands and scrubby areas (2). It occurs in a chalk pit in Suffolk (2).

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Military orchid status

Nationally Rare and Vulnerable in Great Britain, Vulnerable in Europe (3). Fully protected under Schedule 8 of the Wildlife and Countryside Act (1981)

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Military orchid threats

Climatic factors such as cold weather are likely to affect this warmth-loving species (2), which is on the very edge of its range in Britain (5). Over-shading due to a decrease in traditional woodland management is also likely to have contributed to the decline of this species (2). Trampling of seedlings is a risk (2), and as with all orchids, collecting has taken its toll.

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Military orchid conservation

The site near Marlow, Buckinghamshire is wardened, and the plants are protected from trampling by fencing. Habitat management at the site includes tree thinning and grazing by sheep to create suitable conditions for the orchid. Pollination is carried out by wardens to maximise the chance that seed will be set (5). At the site in Suffolk, the plants are also well protected (2). The military orchid is fully protected under Schedule 8 of the Wildlife and Countryside Act 1981, so it is illegal to uproot, cut, sell or destroy this species.

There may be further information about this species available via the National Biodiversity Network Gateway.
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Find out more

For more on the story of the demise and return of the military orchid see:

Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.

Marren, P. (1999) Britain's rare flowers. Poyser Natural History, London.

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Authentication

Information authenticated by Royal Botanic Gardens, Kew:
http://www.rbgkew.org.uk/

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Glossary

Calcareous
Containing free calcium carbonate, chalky.
Lip
In plants, petal or petals that form a lobe.
Perennial
Plants that live for at least three seasons; after an initial period they produce flowers once a year.
Sepals
A floral leaf (collectively comprising the calyx of the flower) that forms the protective outer layer of a flower bud. (See http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure).
Tuber
In plants, a thickened stem or root that acts as an underground storage organ. Roots and shoots grow from growth buds, called 'eyes', on the surface of the tuber.
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References

  1. IUCN Red List 2000 (March 2002): http://www.redlist.org/
  2. Grey-Wilson, C. (1994) Eyewitness Handbooks: Wild Flowers of Britain and Northwest Europe. Dorling Kindersley, London
  3. JNCC (March 2002): www.jncc.gov.uk/habitats/jncc270/e2_6_5_1.htm
  4. Marren, P. (1999) Britain's rare flowers. Poyser Natural History, London.
  5. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
  6. Wigginton, M.J. (1999) British Red Data Books 1; Vascular Plants. 3rd Edition. JNCC, Peterborough.
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Image credit

Military orchids in flower  
Military orchids in flower

© Geoff Trinder

Geoff Trinder
The Croft
Carrhouse Road
Belton, Nr.Doncaster
South Yorkshire
DN9 IPG
United Kingdom
Tel: +44 (0) 1427 872 051
geofftrinder@btinternet.com

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