Interrupted brome (Bromus interruptus)

Interrupted brome flower
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Interrupted brome fact file

Interrupted brome description

GenusBromus (1)

This member of the grass family was discovered in 1849 and identified as an endemic English species. It gets its unusual name from the fact that the individual flower spikelets are not continuous along the flowering stem, but are 'interrupted' with gaps between them.

Height: 5-50 cm

Interrupted brome biology

In the years following its discovery the plant spread rapidly, which suggested to some that the plant might be an introduced species. However, it is now believed to have been the result of a spontaneous genetic change that occurred to one of its related bromes, as they are a family much given to mutation events and hybridisation.


Interrupted brome range

Believed to be extinct in the wild, interrupted brome was formerly found in south and west England, from Lincolnshire down to Kent and Somerset.

You can view distribution information for this species at the National Biodiversity Network Atlas.

Interrupted brome habitat

This species used to be closely associated with arable farming and the animal fodder crop sainfoin, Onobrychis viciifolia, rye-grass and clover.


Interrupted brome status

The interrupted brome is classified as Extinct in the Wild (EW) on the IUCN Red List (1).

IUCN Red List species status – Extinct in the Wild


Interrupted brome threats

This species was last seen in the wild in Cambridgeshire, in 1972. One reason for its disappearance is thought to have been improved methods of agricultural seed cleaning. With the collapse of the market in fodder, following the decline of horse-drawn transport, interrupted brome had fewer and fewer opportunities to recover its dwindling populations. It is a poor competitor, and the development of highly competitive crops, which rely on nitrogen fertiliser, did not help the plant's fortunes, either.


Interrupted brome conservation

The interrupted brome is listed under the UK Biodiversity Action Plans and included in English Nature's Species Recovery Programme. As it is now known to be extinct in the wild, it is vital that the seed bank is maintained and several botanic gardens hold stocks. These include the Royal Botanic Gardens, Kew, RBG, Edinburgh, Cambridge and Ness.

The plant is propagated from seed at the various botanical gardens. Land at its last known site in Cambridgeshire was cultivated in the hope that new plants might germinate from a buried natural 'seed bank'. However, this proved unsuccessful.

Interrupted brome is one of a large number of plants associated with farmland, which have disappeared or declined severely in number. It is highly likely that any project that benefits the brome will help conserve many other species as well.

There may be further information about this species available via the National Biodiversity Network Atlas.
The UK Biodiversity Action Plan for this species is available at UK BAP.

Find out more

See also Royal Botanic Gardens, Kew:



Information supplied by English Nature



A species or taxonomic group that is only found in one particular country or geographic area.


  1. IUCN Red List (June, 2011)

Image credit

Interrupted brome flower  
Interrupted brome flower

© Tim Rich

Tim Rich


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